We use several sources[1], in particular Yahoo, Bing and Yandex, and then try to improve relevancy in the results as much as possible. [1] https://duck.co/help

We use several sources[1], in particular Yahoo, Bing and Yandex, and then try to improve relevancy in the results as much as possible. [1] https://duck.co/help/results/sources https://duck.co/help/results/sources