No. As of now, no man from Vietnam or anywhere else has actually traveled to the moon in the way a traditional story might imply. So it's most likely a fictional or mythological story.
I'm not really sure specifically about a 'vietnamese man on the moon story'. It could be a local folktale or a modern fictional creation. There may be a story within Vietnamese culture that involves a man's journey to the moon in a symbolic or imaginative way.
The Man on the Moon story is indeed true. NASA's Apollo program was a remarkable feat of engineering and human exploration. Astronauts like Neil Armstrong and Buzz Aldrin walked on the lunar surface. The scientific and technological achievements of that time are well - documented and verified, making the Man on the Moon story a real and significant part of human history.
Well, there are many tales. Some say the Man in the Moon is a banished god, while others believe he's a spirit trapped there. Each story brings its own charm and imagination.
The Vietnamese origin story has roots in pre - history. Archaeological findings suggest that the area now known as Vietnam was populated by early humans thousands of years ago. These early inhabitants gradually developed into the Vietnamese people we know today. Their origin was also shaped by migrations within Southeast Asia and the adoption of new technologies and cultural practices from both local and foreign sources.