Figure out a way to route all of your writing through your search engine, and have it flag phrases which do not occur in its database, or which occur much less frequently than similar ones. So, in this case, it would ask: "Did you mean 'desert planet'?"
Alternately, you could just have your secretary check everything before it goes out. You know, like they did in the old days. But then again, I still program in PL/I, and tie handwritten notes to the legs of pigeons.