When you perform that, the program will show you a list of searchers you have previously listed on the configuration panel.
Then you drop the word on the desired searcher and it will list the results for your request.
It is possible to choose among a list of more than one hundred of searchers, so the query will have a response for sure. You decide if you want search in the usual ones or try other options, maybe the solution is there.
In addition if you right click it, it will suggest you a certain searcher deppending on the word you want to search.