Google dominates in most countries, however, there are notable exceptions. The most significant ones are Baidu and Qihoo 360 in China, Yandex in Russia, Naver in Korea, Yahoo in Japan. Many people don’t know that in in Czech Republic the dominant search engine is Seznam.
Admittedly, this is a small market. But if it is an important market to your company Seznam should be on your radar. Advertising information in English is here