Thread:Project:Support desk/Search function only searches for exact topics - how can I change that?

When I use the search function I never get any results at all, except when I search for the exact name of the article. However I would like the search to display every article related to the search word. E.g. when I search "game" I would like to be shown all articles that have the words "game", "games" and similar in the title. The only thing I get it suggestions to create an article called "game" in this case. Can anybody please explain in "beginners" terms how I can change that? Thank you :)

I use Media Wiki Version 1.16.5, PHP 5.2.17 (cgi-fcgi), SQLite 3.3.7

The link is: http://www.wikiinclass.cwsurf.de/mediawiki/index.php?title=Hauptseite