The vBulletin search function, frankly, sucks.
Your best bet is to use your favorite search engine and insert the phrase "site:thefiringline.com/forums" and then your search criteria. Regular search engines use Boolean Operators (AND, OR, NOT or AND NOT) which allow you to narrow or expand your search and their "IQ" just seems a lot higher.
Still happily answering to the call-sign Peetza.
The problem, as you so eloquently put it, is choice.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.