There has always been a search feature on the site. Just go the main forum page: http://www.speakoutwireless.ca/speak/ and you will see the search feature right under your logged in name.
Other than the annoying ads at the top of the Google search, it should be returning mostly content from the forum, since there isn't much content on this site other than the forum. I find the results from the Google search better. However, that's somewhat subjective and yes, there is a forum-specific search feature as iamdrumming pointed out.
This site is run by a 7-Eleven Speak Out Wireless customer. I am not a 7-Eleven employee, nor do I receive any compensation from them for providing this site. The goal is simply to share consumer information with others.