There are a couple of different ways to search for items. The most powerful method is by clicking on the "Search" button on the toolbar above and completing any relevant fields to help find what you are looking for. You can specify price ranges, specific buyers and sellers and locations as well as standard word searching.
You can also do a quick search at the top of most category pages by filling in the search box and clicking the smaller search button beside it. You can specify if you would like to search only the current category and its subcategories as well as perform title and description searches. By default the quick search box requires all words to match, however you can specify "or" if you would like to search for items that match any of the words, for example "glass or house" would match items with either "glass" or "house" instead of requiring both "glass" and "house" to be matched.