My search was "klm premier", since I wanted a KLM aircraft from Premier Aircraft Design. Up popped exactly the files I wanted. If that had not worked, I would have tried some different variation. Whether searching with Google or at FlightSim.Com or anywhere else on the web you'll often have to try a couple of things before you get the results you want.
For example, aircraft names are inconsistent. The plane in question could be described as an MD-11 or as an MD11. To the human eye those look the same, to a computer indexing the description those are two different terms.
Hopefully you did not really search on "KML"!