you have to know how to search & filter through all the crap.
As far as I can tell,
A) vendors have some way to add hidden keywords, then load them up with tons of stuff unrelated to what you were searching for,
or B) eBay just randomly adds 25% or more random items to the search results.
Nothing else can explain how I can search for "5/32 carbide drill" and I get hundreds of hits on shoes, jewelry, purses, Game of Thrones DVD sets, antique toilet paper holders...