I'm sorry that some of the search options you're used to aren't available any more. These features were very lightly used but I understand they were loved by a few. See this thread:
TalkBass search overhauled
The switch to this search was necessary - I don't just take away features for the heck of it

It was either this, or start deleting posts from TalkBass to keep us from going over 4 million.
The search that we're using now is a user-contributed collaborative effort 'hack' for VBulletin, by fellow webmasters with forums over 4 million posts. As such, it's development is ongoing, and it should not be too long before it is able to do all the 'with xx replies' type searches that the built-in
vb search could do.