This is exactly why I stopped using DDG as my main search engine. My workflow was often like this:

- Search for term on DDG - Look at results, find nothing - Try to find better term - Give up and use original term in Google - Find result

I tried to use DDG exclusively two time (once 8 months ago, once ~4 months ago), but the result was the same. I don't know how much personalization affects this, but Google just gives me the best results.