Hi
For my request https://nominatim.openstreetmap.org/search?q=les%20bois&countryCodes=CH&addressdetails=1&format=json I was looking for https://www.openstreetmap.org/relation/1685609 but somehow it was not part of my response, even though I explicetly added CH (Switzerland) as a bias/countryCode.
This is the response I get:
[{"place_id":82106945,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":1657553795,"lat":"48.0342786","lon":"1.4148116","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Lutz-en-Dunois, Villemaury, Châteaudun, Eure-et-Loir, Zentrum-Loiretal, Metropolitanes Frankreich, 28200, Frankreich","address":{"hamlet":"Les Bois","city_district":"Lutz-en-Dunois","village":"Villemaury","municipality":"Châteaudun","county":"Eure-et-Loir","ISO3166-2-lvl6":"FR-28","state":"Zentrum-Loiretal","ISO3166-2-lvl4":"FR-CVL","region":"Metropolitanes Frankreich","postcode":"28200","country":"Frankreich","country_code":"fr"},"boundingbox":["48.0142786","48.0542786","1.3948116","1.4348116"]},{"place_id":81810265,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":2908329506,"lat":"48.8840835","lon":"0.2529664","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Roiville, Mortagne-au-Perche, Orne, Normandie, Metropolitanes Frankreich, 61120, Frankreich","address":{"hamlet":"Les Bois","village":"Roiville","municipality":"Mortagne-au-Perche","county":"Orne","ISO3166-2-lvl6":"FR-61","state":"Normandie","ISO3166-2-lvl4":"FR-NOR","region":"Metropolitanes Frankreich","postcode":"61120","country":"Frankreich","country_code":"fr"},"boundingbox":["48.8640835","48.9040835","0.2329664","0.2729664"]},{"place_id":77042803,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":1744647108,"lat":"46.2983804","lon":"4.4313065","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Aigueperse, Villefranche-sur-Saône, Rhône, Auvergne-Rhone-Alpen, Metropolitanes Frankreich, 69790, Frankreich","address":{"hamlet":"Les Bois","village":"Aigueperse","municipality":"Villefranche-sur-Saône","county":"Rhône","ISO3166-2-lvl6":"FR-69","state_district":"Rhône","state":"Auvergne-Rhone-Alpen","ISO3166-2-lvl4":"FR-ARA","region":"Metropolitanes Frankreich","postcode":"69790","country":"Frankreich","country_code":"fr"},"boundingbox":["46.2783804","46.3183804","4.4113065","4.4513065"]},{"place_id":81403827,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":9988030471,"lat":"47.6383037","lon":"0.5090336","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Villebourg, Chinon, Indre-et-Loire, Zentrum-Loiretal, Metropolitanes Frankreich, 37370, Frankreich","address":{"hamlet":"Les Bois","village":"Villebourg","municipality":"Chinon","county":"Indre-et-Loire","ISO3166-2-lvl6":"FR-37","state":"Zentrum-Loiretal","ISO3166-2-lvl4":"FR-CVL","region":"Metropolitanes Frankreich","postcode":"37370","country":"Frankreich","country_code":"fr"},"boundingbox":["47.6183037","47.6583037","0.4890336","0.5290336"]},{"place_id":73779207,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":6035027785,"lat":"45.9419634","lon":"0.7744818","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Chabrac, Confolens, Charente, Neu-Aquitanien, Metropolitanes Frankreich, 16150, Frankreich","address":{"hamlet":"Les Bois","village":"Chabrac","municipality":"Confolens","county":"Charente","ISO3166-2-lvl6":"FR-16","state":"Neu-Aquitanien","ISO3166-2-lvl4":"FR-NAQ","region":"Metropolitanes Frankreich","postcode":"16150","country":"Frankreich","country_code":"fr"},"boundingbox":["45.9219634","45.9619634","0.7544818","0.7944818"]},{"place_id":80818947,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":10998116693,"lat":"46.6772215","lon":"2.2978806","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Saint-Pierre-les-Bois, Saint-Amand-Montrond, Cher, Zentrum-Loiretal, Metropolitanes Frankreich, 18170, Frankreich","address":{"hamlet":"Les Bois","village":"Saint-Pierre-les-Bois","municipality":"Saint-Amand-Montrond","county":"Cher","ISO3166-2-lvl6":"FR-18","state":"Zentrum-Loiretal","ISO3166-2-lvl4":"FR-CVL","region":"Metropolitanes Frankreich","postcode":"18170","country":"Frankreich","country_code":"fr"},"boundingbox":["46.6572215","46.6972215","2.2778806","2.3178806"]},{"place_id":75686275,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":2024913155,"lat":"45.7310678","lon":"6.3949662","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Marthod, Albertville, Savoyen, Auvergne-Rhone-Alpen, Metropolitanes Frankreich, 73400, Frankreich","address":{"hamlet":"Les Bois","village":"Marthod","municipality":"Albertville","county":"Savoyen","ISO3166-2-lvl6":"FR-73","state":"Auvergne-Rhone-Alpen","ISO3166-2-lvl4":"FR-ARA","region":"Metropolitanes Frankreich","postcode":"73400","country":"Frankreich","country_code":"fr"},"boundingbox":["45.7110678","45.7510678","6.3749662","6.4149662"]},{"place_id":76907062,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":3691932560,"lat":"46.2338252","lon":"4.3908132","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Saint-Clément-de-Vers, Villefranche-sur-Saône, Rhône, Auvergne-Rhone-Alpen, Metropolitanes Frankreich, 69790, Frankreich","address":{"hamlet":"Les Bois","village":"Saint-Clément-de-Vers","municipality":"Villefranche-sur-Saône","county":"Rhône","ISO3166-2-lvl6":"FR-69","state_district":"Rhône","state":"Auvergne-Rhone-Alpen","ISO3166-2-lvl4":"FR-ARA","region":"Metropolitanes Frankreich","postcode":"69790","country":"Frankreich","country_code":"fr"},"boundingbox":["46.2138252","46.2538252","4.3708132","4.4108132"]},{"place_id":77243213,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":1735531340,"lat":"46.5613689","lon":"5.14634","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Montpont-en-Bresse, Louhans, Saône-et-Loire, Burgund und Freigrafschaft, Metropolitanes Frankreich, 71470, Frankreich","address":{"hamlet":"Les Bois","village":"Montpont-en-Bresse","municipality":"Louhans","county":"Saône-et-Loire","ISO3166-2-lvl6":"FR-71","state":"Burgund und Freigrafschaft","ISO3166-2-lvl4":"FR-BFC","region":"Metropolitanes Frankreich","postcode":"71470","country":"Frankreich","country_code":"fr"},"boundingbox":["46.5413689","46.5813689","5.1263400","5.1663400"]},{"place_id":81623071,"licence":"Data © OpenStreetMap contributors, ODbL 1.0. http://osm.org/copyright","osm_type":"node","osm_id":414091012,"lat":"48.693276","lon":"0.7129853","class":"place","type":"hamlet","place_rank":20,"importance":0.25000999999999995,"addresstype":"hamlet","name":"Les Bois","display_name":"Les Bois, Irai, Mortagne-au-Perche, Orne, Normandie, Metropolitanes Frankreich, 61190, Frankreich","address":{"hamlet":"Les Bois","village":"Irai","municipality":"Mortagne-au-Perche","county":"Orne","ISO3166-2-lvl6":"FR-61","state":"Normandie","ISO3166-2-lvl4":"FR-NOR","region":"Metropolitanes Frankreich","postcode":"61190","country":"Frankreich","country_code":"fr"},"boundingbox":["48.6732760","48.7132760","0.6929853","0.7329853"]}]