What I've just noticed is that if you search for the last term in a tutorial header
ie:
How to upgrade to Windows
XP
Searching for XP, you will find the article in the search results, but if you search for any of the other words (how, to, upgrade, windows) - you will not find the article in the results.
Give it a test at
http://www.ostutorials.com/tutorials...&action=search
With an actual article on the site,
Global AWStats v5.6 on Ensim