I tried to use DuckDuckGo, but even still I feel its results are not up to par with Google, despite Google's results sliding in quality year after year. Qwant has been a decent supplement, the results for general queries are good and on the more specific ones (part numbers, key terms from papers and articles) its equal to or better than Yahoo/Bing.

On specific queries, Google has really dropped the ball. Part numbers get ignored or rewritten, and results are just plain missing (despite other search engines having those key results).

I was looking for a company developing intraocular lenses that are better than a healthy human one but I couldn't remember the company's name. My search was

artificial lenses better than human

Google gave me the company name on it's 3rd result description but duckduckgo gave me irrelevant stuff all the way down. That was yesterday. Today duckduckgo gives me the company name on the description of the second result. So it's pretty volatile I guess.