You can search for keywords on the forum search page. The best way to start is by selecting "Search for all terms", so that each search for posts contains all words.
Searching in a specified forum or category will narrow your search even further, thus it's only advised if you understand what each forum/category contains.
Don't use twenty keywords on the first time, but use a few descriptive words: "template parse error", "index blank screen", "save admin settings", or "download module category."