The search engine will find all the questions that include your search term in the question title or the body of the question. It will not give you discussions that include your search term in one of the answers. (Currently, there is no way to search the answers.)
Let's say you wanted to find a question about "BTL" (below the line). When you search on "BTL" you could get questions including the word "suBTLe" mixed in your search results. So scan your results, and choose a headline that looks likely. Then use your browser's FIND feature to quickly jump to "BTL" on that page.
You can put a user's name in the Search Term box to find all questions posted by a user (or questions that mention that user in the body of the question).
Boolean operators don't work with this search engine. So you can't cross-reference two search terms like "marketing AND plan". But you can search for "marketing plan". For more flexibility, try Google's Advanced Search page. Enter "acrwebsite.org" for the domain to limit your results to our site