Thread:Project:Support desk/German Mediawiki 1.24.2 search

Using Mediawiki for some Time, we noticed a strange behaviour of the search:

Search for stevie, you get correct results. Search for Wonder, nothing is found. Search for "stevie Wonder", you get correct results.

Software Version MediaWiki 1.24.2 PHP 	5.4.34 (cgi-fcgi) MySQL 	5.5.40-0ubuntu0.12.04.1

Can someone explain this?