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Dac Nhan Nhan - by Dale Carnegie is the most famous, best-selling and most influential book of all time. The work has been translated into almost every language in the world and is available in hundreds of countries.

This is the only book about the self-help genre, which has consistently topped the bestselling list by The New York Times for 10 years. The English version of the book alone has sold more than 15 million copies worldwide. The work is incredibly viral - no matter where you go, any country can be seen. The work is considered to be the first and best book, has the effect of changing the lives of millions of people around the world.