Don't know, but saw several request this morning for an 'expert'. Well, throw some plain English at the Google engine (Bing simply is not up to snuff I think), and you usually get some 'expert' answers from which you can refine the searches. So today's query was (actually did it 2 months ago producing same now):

"Linux change permission on files" which evolved into "Linux chown example", which gave me a list from which I chose the second: How to change a file's owner and group in Linux

The beauty with Firefox (even on Linux) and Google search box is that it starts offering search phrases. Read carefully and there often is something that hits the jackpot.

Sometimes I use Clusty, a multi search engine indexer. It provides a left margin summary of search results by key topics and words.

Now the 65,000 dollar question for you: How do you do your answer finding?