Why do Vietnamese get Tattoos?

are you talking about vietnamese americans??

maybe because they got influence by american hip hop culture.

when i think of chinese/vietnamese with tattoes i think of the chinese triads. 

Just watching you tube Videos about Vietnam and I notice so many people walking down the streets with tattoos.  I'm thinking their is no stigma associated with Tattoos.

I also think that we Filipinos revived interest in Tattooing in East Asia somehow. 

Ancient Filipino men are usually tattooed only if they were skilled warriors, tattoos were not for protection or magic but earned when you killed people in battle or are leaders of a barangay.

https://www.aswangproject.com/beautiful-history-symbolism-philippine-tattoo-culture/

And we usually walked around shirtless and exposing our muscles since its hot and tropical.

We also sang a lot with the fiercest warriors simultaneously being the most soulful singers.

The American anthropologist-historian William Henry Scott, quoting earlier Spanish sources, in his book "Barangay: Sixteenth Century Philippine Culture and Society", also recorded that Visayans were a musically minded people who sang almost all the time, especially in battle, saying:

Visayans were said to be always singing except when they were sick or asleep. Singing meant the extemporaneous composition of verses to common tunes, not the performance of set pieces composed by musical specialists. There was no separate poetic art: all poems were sung or chanted, including full-fledged epics or public declamations. Singing was unaccompanied except in the case of love songs, in which, either the male or female singers accompanied themselves with their respective instruments, called kudyapi or korlong. Well-bred ladies were called upon to perform with the korlong during social gatherings, and all adults were expected to participate in group singing on any occasion.^[70]

And we also wore a lot of gold jewelry since gold was abundant.

Foreign women and even men would be definitely impressed to see muscled shirtless tattooed honey skinned warriors bedecked in gold sailing around and singing their hearts out in battle.

Maybe the Chinese were astounded when this dude and his tiny band of warriors raided deep into China for the sake of love!!!

The Jesuit Alcina tells tales about a rich nation he called the 'Venice of the Visayas', pointing to the Kedatuan of Dapitan at that time. The Jesuit also tells of a Dapitan princess named Bugbung Hamusanum, whose beauty caused her suitor, Datu Sumangga of Leyte, to raid parts of southern China to win her hand.^[1]

https://en.m.wikipedia.org/wiki/Kedatuan_of_Dapitan