Searching TRIPanswers is fairly easy and currently basic (no Boolean etc), but this will evolve if there is a demand.
If you want to search for prostate cancer, simply type prostate cancer in the search box. If you want to search for prostate cancer screening, type prostate cancer screening.
We have envisaged users searching for their basic concept and then clicking on a relevant term in the tag cloud (if there are lots of results). In other words, the initial search gets you close to your Q&A while the tags allow you to refine your search to your topic of interest.