eBay does a nice job helping you compare similar searches with different numbers of words. For example, if you search for Ludwig Fab 4 Classic on eBay it will return zero results, but it will offer you the follow examples:

This sort of reminds me of 37betterGoogle. People often times don’t know how many words to use or in what order. eBay definitely helps you figure out the right combination and shows you how many results you can expect by adding or removing a word. Nicely done.