The plain old search at the top of the page is the one that I was using. Try this: search for "the flip flop operator", without quotes. Now search for "flip flop operator". See which one has 5 squillion results, and which one doesn't? That's why I was asking for common words (like "the") to be ignored when not in quotes.

Now, I must have been smoking some good crack or something, because I've just tried it, and unless something's changed in the meantime, this is pretty much what happens when you quote "the flip flop operator" (with quotes). Hmm. Where's my pipe.