Extended Searching

is it possible to find a song through every word in the songs, instead only the title?

Yes, click the magnify glass at the top.  That will bring up the global search and will search within cue lists and within song lyrics.

but is not possible to add directly in the cue

Currently, in the cue edit mode, only filtering by song title, artist or ccli # is possible.  Would you like to be able to search by lyrics on that screen?

Yes, if is possible