I guess you are right, it depends on the manner in which a member is using it and for what purpose.
The forum search function might not be ideal but it usually does display the information being searched for along with several variables even though it might take a few seconds more to load than say the usual out-and-out search big corporation engine URLs.
I would still not be against any form of revamp because if there is scope to update any functionality of the forum, it should be considered.
Maybe you should think that the forum search is not designed to search for such simple words? How many responses did you expect to receive in response to your request, given that the address "sir" is quite normal and natural in many countries? And also, how many bounty hunters, especially from Asia and maybe Nigeria, are present at the forum every year?
In exactly the same way, one could query for words like "yes" and "no."
For me, the search works fine. Maybe you just need to understand the possibilities of the forum and not compare it with global search engines.