What does triple happiness mean?

This word refers to the name of the movie.

Three Happiness is a movie, which was produced by Tianjin Film Studio in 2004. The film is directed by Li Xiaohua, starring Yao Xin, Gu Hanbo, Zhang Yinghong, Yanjiao, Guan Xinwei and Zhang Chengwu.

The film is about Dashun, who is a tour guide in the city. Because his mother is seriously ill, she is rushed home. Mother had a premonition that her days were numbered, so she urged Dashun to marry Ling Hua, who had taken care of herself for many days. But Dashun had already taken a fancy to Taihō. In order to satisfy her mother, she had to discuss with two girls and marry Ling Hua. I didn't expect my mother's illness to be cured. Ling Hua felt that the fake play was very promising, but Dashun and Taihō were anxious and made a lot of jokes.