How does Advanced Search work?

oh, one more thing: the log file can be your friend. Verify whether
there's any error message to start with.

Start with a simple text search without tweaking any of the additional
controls. Just type a track or album title. And in case you do have
library views, make sure you're not dealing with your kids' library
while searching for AC/DC.

And if you've got a query which you believe should return something, but
does not, you can enable logging for database.sql and post the resulting
SQL query here for our enjoyment :-)
--

Michael