My searches in the WoW part doesn't seem able to find items when using the ' symbol in the search, i've tried a few items with it in their name and when searching for the name nothing shows up.
http://wow.allakhazam.com/search.html?q=giantstalker's
http://wow.allakhazam.com/search.html?q=giantstalker
Seems to be the same in advanced item search.