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.

Keywords:
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2 lines found
[060605 18:46] f2e1e, Peanut: test
[060607 15:36] f2e1e, Peanut: test s'mores