Keywords are inclusive, so the more keywords you put in, the less lines you'll find.
You can specifically ask for a keyword to not exist by prefixing it with !.
For example, searching for "mouse !cheese milk" would find lines that contain both mouse and milk but not cheese.

[051227 13:23] 1b5e9, Imp: :/

[051229 05:02] 5dbf8, *Topaz: GREG! PAULIE! go go go....http://pjj.cc/abaddon/

[051230 23:50] b0058, Black Vitale: Since I'm here it tells me that it's time for all the oldies to have a reunion. Black calling all oldies.... calling all oldies... bzzzzzztttttttt..............