Want to get a quick way to see what people search on your community? Use the site search setting within Google Analytics. This will create a report with all the keywords your community members are searching for.
To set up search tracking, all you need to do is head to the view settings. Enable site search tracking, then include the parameter that denotes a search. For Vanilla, the term is "search".
Please note: Site searches will start being tracked the moment it's enable. Keep in mind the tracking is not retroactive.