When running a search, if you don't want certain items in the return, put a dash (-) in front of what you want suppressed. For example, when I look for Kaiser parts, my search looks like this:
kaiser -helmet -cover -caps -mats
The above search will return everything but things like those german WWI helmets, a car cover, wheel cover, hubcaps, and floor mats. Note that a space has to be placed between each item but not between the dash and the item you want to suppress. Give it a try, it works!