If it is a blacklist, it's not a very good one. "pedobear." and "pedophile." work fine. I don't understand why they would want to block these anyway. One's just a meme, and the other is a bunch of mugshots of strange looking men.

They have been censoring any results vaguely related to pedophilia for the past year. If you search for "lolis" or "lolicon" which are fictional cartoons, that will be censored.