Two easy ways to narrow down search results-
1) The word "and" is required if you want to search for more then one word. Ie- "clutch install" will only search for clutch while "clutch and install" will search for both words. If you want to search for the words clutch and install, you must put the "and" between them. If you get too many results for your liking, adding another "and", like "clutch and install and how" might narrow down the results, since it would look for those three words.
2) Searching just thread titles is a search option, and it can also help reduce the amount of search results. Ie- There are probably less threads with clutch install in the title then in the thread, and the search lets ya just search through titles if ya want....