Maybe I should have known more about this years ago - I actually have thought about it - just never investigated it. Nevertheless, you can use predefined keywords to make a more precise search for you KB articles. Not all keywords are in the help article. Some, you have to figure out yourself.
Two useful ones are Windows SP2 fixes kbwinxpsp3fix and Office 2003 SP 2 ones kboffice2003presp2fix.