I can't find a specific show in search

Search results come directly from AniList's catalog, so if a title exists on AniList it should be searchable on Zenbu. Try the romaji or alternate title if the English name isn't turning up results — some titles are indexed under a different name than you'd expect.

If it's an adult-rated title, make sure "Display Adult Content" is enabled on your AniList account — Zenbu follows that setting and won't show adult titles if it's off.