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.

[060526 19:08] 655b3, *Hunter Gabrielolus: I normally don't do this, but because I did see mention of a couple of people who used to play in the VK. Me and Elizabeth LeBeau are revamping her room. We have a few other old timers from the VK in there such as Starfire and Lucreccia. The room is technically open for play, and it is a freeform room with White Wolf characters accepted. Those who are interested in checking it out, the address is http://pjj.cc/tdr . The name of the room is The Dark Realm.