Why did Hai Aohua predict that the author would go to Vietnam?

Haiaohua predicted that there would be three endings for mankind.

Some humans have entered the center of the earth and become human beings in the center of the earth. The second kind of human is also the vast majority of human beings. They immigrated to other planets by spaceship at the speed of light, and there was a third kind of human. They are reluctant to leave because they miss their homeland, so they still live on the surface of the earth and are attacked by alien civilizations. In the end, all the humans left on the surface of the earth were destroyed.