Traditional Chinese: 新年快樂; Simplified: 新年快乐.
Xin Nian (新年) is New Year. Xin is new and Nian is year.
Kuai le (快樂) is happiness, joy, delight, or rejoicings.
So "Happy New Year" in English is "New Year Happy" in Chinese: Xin Nian Kuai Le.
A more common way for business people to greet each other at the beginning of the Chinese New Year is: Gong Xi Fa Cai.