I use DuckDuckGo mostly, I always want a specific part of the Django documentation, say so I don't get the movie links (except for an ad).

As you say "django" gives you the movie, but "django class based views" gives you what you would expect.

For most search I feel that DuckDuckGo has become increasingly good, while Google has become worse. It might be because I don't login or flush cookies when I close my browser, but that would mean that Google rely on personalization to a disturbing degree.

Sure, but it was a kind of general example I was giving. My problem when I specify class based views, is that it usually takes me to version 1.3, while Google points me to the dev version (usually I want the most recent stable version so neither is perfect in that respect, but Google is usually closer).

Well, they could do client-side filtering/sorting, saving the personalization parameters in local storage. It'd require the server to send a bunch more results up front, though, otherwise the client would have little to work on.