First, check your spelling again. Sometimes your fingers might have slipped on the keyboard without you noticing it.

Next, try to think of alternative spellings. For example, if you were looking for "horseshoe crabs," but happen to spell "horse shoe" as two words instead of one, you wouldn't find appropriate results.

The next solution is to search for something more general. Yahoo! Kids searches only on the words in the titles and comments of the sites we list, so often a site has information that you're looking for but it doesn't show up in the search results. For example, if you do a keyword search for "Renaissance Medicine" and don't get any results, it would be a good idea to look for sites just on the Renaissance or just about medicine to see if they have the specific information you're looking for.