You can also parenthise keywords you DO want by omitting the "minus" sign as used in the previous post.
bmw (2002, tii, 2000, touring) will give you anything with "bmw" and any of the other four words.
You can use "*" as a wildcard.
325i* will give you 325, 325i, 325is, 325ix, etc.
Double quotes will give you an exact phrase with no extra words between the enclosed keywords.
And if you want parts but not cars or bikes, search only in "ebay motors"->"parts and accessories" and maybe then in "car and truck parts" or "vintage car and truck parts".
Hope this helps,
Steve