I recognized something strange:
On my MacBook Pro (Mid 2008, Mavericks) I get suggestions when searching in the Mac App Store.
But on my MacBook Air (Late 2010, Mavericks) I don't get them.
Mac App Store Search Autocompletion
mac-appstore
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Best Answer
Try resetting the Mac App Store.
Enable the debug menu and restart the Mac App Store.
Choose the Reset Application option and restart the Mac App Store.