Poser 7  has no search. Poser 8 does, and it works fairly well. You might want to download the free version of  P3DO http://www.renderosity.com/mod/freestuff/details.php?item_id=60191

It's handy when looking for stuff.

Also, unless you re-install your DAZ materials with the Poser option enabled, you're not going to get results for them. The file structures are different. Everything must be in a Poser runtime for Poser to see it.

Hope this helps.