Always double-check your spelling if no results are returned.
Only documents containing all of the words in the query will be returned. If
you are looking for a very specific item, type in several words that will
definitely be included in that document. For example, if you're looking for
articles on marriage tax, type in both "marriage" and "tax". If you're looking
for something less specific, just type in "tax" and you'll get more matches.
Search by using phrases. Use the "-" key to group a set of words together as
a phrase, such as "high-blood-pressure". This will only match words that appear
next to each other in the order that you type them. Separate multiple phrases or
proper names with a space, such as "Bill-Clinton, Trent-Lott".