Namely get rid off the following.
"The following words in your search query were ignored because they are too common words"
I say this because I now realize why people make the mistake of repeating threads multiple times.
server
name
staff
another
character
play
pvp
raid
bug
help
thread
banned
population
class
horde
alliance
Are all unsearchable, and it doesn't matter if you are only searching in thread titles only either. This is especially frustrating when trying to find a thread you say earlier but didn't post in. As you can see the above words are all very common, but that doesn't mean it is pointless to search for them.