Tried theses searches in the OP's recommended sites, and they all seem rather dedicated to debunking rather than just giving links based on the search.....
Just tried Yandex, and it actually seems better at pulling up controversial searches with links at the top instead of buried....
Best keywords to verify if search engine is biased:
If you don't see correct suggestions or results - you know what it's worth.
Tried theses searches in the OP's recommended sites, and they all seem rather dedicated to debunking rather than just giving links based on the search..... Just tried Yandex, and it actually seems better at pulling up controversial searches with links at the top instead of buried....