Looking up a search term + the name of a website gives poor results

[lolcatw]

If I search up javascript undefined, I get fairly good results, although none of the results immediately show me Stackoverflow answers. But if I instruct it to get search results from Stackoverflow explicitly by appending stackoverflow to my query, I only get 2 results:

Maybe it would be a good idea to add a "discussions" tab to only search discussion websites?