I can't understand how partial matches work in Nominatim

I can't understand how partial matches work in Nominatim. For example, let's take a look at Sesame Lane Childcare Centre in North Lakes, Australia. The following queries contain a partial name of this amenity and find it:

Sesame Lane Childcare Centre
Sesame Lane Childcare Centre north lakes
Sesame north lakes

But the following do not:

Sesame lane north lakes
Sesame lane childcare north lakes
Sesame lane centre north lakes

In contrary, let's consider Palace of Culture and Science in Warsaw, Poland. Every query containing a partial name of this building I tried finds this building:

palace culture warsaw
science culture warsaw
and culture warsaw
palace of science warsaw

I know that

> Nominatim reads queries from left to right

and that full matches are listed before partial matches, and that some keywords such as pub are automatically converted to amenity=pub. Here, only childcare is a keyword but it doesn't explain why even Sesame lane north lakes is not found unless lane itself is also considered special but I am not sure whether it explains a difference between Sesame Lane Childcare Centre and Palace of Culture and Science. Can anybody explain what's the difference between them?