Boards have a pre-programmed thing for the search-engine, to not accept any word under 4 letters, so it could, theoretically, keep vague topics more specific. The mods have tried to fix it, but its the program the server is run on. But hey, its free; and Im not choosy.
not 100 % sure if this works, does seem to pick out some thread with the words i searched for. If you are seraching for something less than 4 words place a * at start.