1. Try different search wordsUse specific words instead of general ones
2. For a closer match, specify a date, color, or brand
3. Search titles and descriptions to get more matches
4. Add or remove the letter “s” for more results 
5. Experiment! How might a seller describe what you're looking for?
6. Be careful when using the words “and”, “or”, and “the”
7. Don’t use extra punctuation
8. Consider Browsing
9. There are many other ways to search on eBay

By Dipika Mirpuri, Via about.com