It is written in ebays terms and conditions somewhere that they may not always show your item, even when a buyer uses search words and terms directly related to your item. This is to "enhance"    the buyer eperience. Mobile phone buyers dont want to scroll through hundreds of listings, so are often only shown a "selection" of listings, selected by cassini and best match.

How about "enhancing"  the sellers experience by showing all listings. Its sellers who pay the bills, not buyers.