You can search for any words in the book title. Additionally you can search for specific servers and authors (currently only signees):
:server:Civcraft_2to only show books that were available during Civcraft 2.0,
:signee:SomethingSaucyto only show books signed by SomethingSaucy.
In the future, full text search, search by topic, genre, original author, time of writing, current ingame library availability, Lawa Nasin, etc. may become available.
Pro tip: If you put just
v as search query, all books are shown.
This quirk works because all Civ servers have a
v in their name, even Devoted.