As pointed out, searching for adblock returns ...
The following words in your search query were ignored because they are too common words: adblock.
(adblockplus will be found, but not "adblock" nor "adblock plus")
Other "common" words that you would expect, or want to find, also fail to turn up.
Each word must consist of at least 3 characters and must not contain more than 14 characters excluding wildcards."
seems too limiting to me to.