Here's a dumb question

Is there a way to do "exclusive " searches on such as "DBI and XML" so that it only returns links with both "DBI" and "XML". As it is, it seems that all searches are "OR" based, which invariably returns too many irrelevant and useless links.

Perhaps I'm missing something real simple, but I didn't find an explaination of how the search engine on the site works anywhere.
Filmo the Klown