Well I have only come across Google search engine which I believe it's the first and that strongest because I have never heard of any country operating any which is so very powerful like that of Google.
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Chinese search engine is called Baidu and the Russia based search engine is called Yandex. I do not think a lot of countries have started their own search engines, Infact most of the search engines re based in the USI know there are some other search engines out there, I know China has one, and so does Russia, but I forget their names. But, are there any other countries out there that have their own search engines? If so, are they worth it to rank your sites on?