Using (+) and (-)
To filter your search results further, use either the plus (+) or minus (-) symbol. Placing the plus sign before a word tells the search engine to include specify words in the search. To find a pair of Nike Shoes that are red, enter "Nike Shoes +red" (note that there is no space between the plus sign and the word that follows it). Conversely, you can use the minus symbol to exclude a word from your search results. So in order to scan Nike Shoe listings with no red shoes you would search "Nike Shoes -red", this will bring up everything but red shoes.

Misspellings
A lot of good deals are found this way. Try common spelling errors in your search. You will be suprised how many listing are spelt wrong and don't make it into the general search because of it. Here's a great tool to use Misspell Finder Enter your search word spelled correctly. There will then be a link below the search box to take you to all the crazy spellings on eBay.