All the results for "e os" are about /e/OS, and that's its full name, so you wouldn't just search for "e". D language is a better example — its just called "D", but searching for that doesn't give results about the language. On the other hand, for "C" and "R" the top results are all about the languages. "Go" is also a pretty bad one, they insist it's not called "golang" but you basically have to search for that to get any useful information.