TVDB movies and shows can't by found via the search function

I noticed that movies and shows that have no TMDB equivalant and can only be synced with TVDB data can’t be found when you search for them. This affects mostly YouTube series and behind the scenes specials.

I tested it with “Kings and Generals”, “Faszination Universum”, “Bad Days” and “Beyond Batman: Nocturnal Overtures - The Music of Batman”. All these titles are existing entrys here in Trakt. But you can’t search for them.