How do i search for routes in OsmAnd

In Osmand i see many walking "routes" on the map. I think these hinking-routes are standard provided by operator "Wandelnet" (network=nwn).

But when using "Search" in the Osmand-app on a route name (like "Marskramerpad") i do not get any results.

How do i search for routes available on the map?