Of course, most people who are looking for the programming language will probably be known to Google to be interested in that, so the result isn't necessarily invalid, but neither is it universal.
cfr. http://dontbubble.us/ as a note, I don't agree with "don't bubble us". Or better I agree but I find the bubble extremely convenient most of the times; when not I do use duckduckgo :)
But that's not exactly the problem. The problem comes up when you're searching for more specific things. Try, for example "go reduce function" (just came up with this example now, I'm sure my argument will be better if you search for an actually real-world edge case) and you'll probably get Go results, but I also get PHP, Javascript and Python results.
If, instead, I searched for any of these languages + "reduce function" I would only get relevant results.
Swift is even worse.