Search hasn't been ported or implemented in OpenACS. I think it's because search in ACS Classic is based on Oracles Intermedia witch isn't available for PostgreSQL and other possible solutions like e.g., PLS, are not open source or they're not good enough...
I've managed to get a nice search (on my dev site) by using the method discussed here.
You *can* have search on the Bboard since Don Baccus made a hack based on an old photo.net solution! (In witch case you'll need to have pltcl language installed.)
