Can't be the REAL C&H search engine: I tried typing in "Bill Watterson" in the box and got NO search results. Seriously? If there's one query to get right, it's that one.
Not really - the search engine is to search the Calvin and Hobbes comic strips. The strips never make any mention of Bill Watterson, so the fact you got zero results is completely accurate.
To split hairs, I imagine his signature could be found in most of the comics...
To split it even further, he only signed his strips as 'Watterson' and so a search for 'Bill Watterson' or 'Bill AND Watterson' should return zero results :P