When I go search for communities I pretty much never get results even if I know certain communities exist. I think the search is only searching the titles maybe? Needs to search the description at least and have fairly loose matching results. Otherwise it’ll come to a point where you have to slog through lists and lists and lists.
Kbin, at least theoretically, sorted out their stuff yesterday. Sorry, haven’t looked at Kbin as a user yet, don’t know how to pull in communities on your end.