Unity search, how to get rid of certain results?

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http://askubuntu.com – When i want to run the calculator, i click on unity first icon (dashboard?), and then i start to type : ca : is showing the calculator as first result (probably because zeitgeist recorded that its the app i use the most) cal : is still showing the calculator as first result calc : is showing libreoffice calc as first result It's annoying because if i hit "enter" libreoffice calc is launched :( I tried to blacklist libreoffice calc in "activity log manager" but the behavior didn't change. So the main question is : How to prevent libreoffice calc to show up as first result without removing it (HowTos)