Below are options for further constraining your search terms.
You can now use Lucene query syntax, as shown here: Lucene query syntax
Fields you can search on include: title, body, user, postid, sectionid, reply (reply:1 = only replies), usenet (1 or 0)
(If you use Lucene commands, the other options here may be ignored.)+title:"hello"
Return all the items with the title "Hello"+user:"hitchhiker"
Return all the items by user 'hitchhiker'-user:"hitchhiker" hello
Return all items not written by user 'hitchhiker' with the word 'hello'your~
Return items like 'yours' eg: ours, pours, tours