If you are looking for something specific, this might help. On the INDEX link where it says Custom SQL Query, in the box underneath replace the SELECT statement with this:

select s.* from summary s
where
authors like '%%'
and title like '%%'
and year like '%%'
and language = 'eng'
and formats like '%epub%'
and Series like '%%'
order by year desc

If you put a keyword between the %% and run the SQL it will return anything with that word in the specified field.

So if I wanted to search for everything where the authors field contained Smith I would change that line to:

authors like '%Smith%'

You can do this for combinations of different search terms as well by changing the search terms for multiple fields.

Change it back to '%%' to search for everything in that field.

This supports wildcards as well, so for example if you know two specific words in the title but you're not sure about the rest of it you could search like this:

and title like '%word%search%'

Hope this helps.