Dating and marriage culture
Though Confucian tradition permits the husband to take lesser wives (theoretically to be chosen for him by the first wife), economic realities (and relatively innocuous modern laws) would force him to be content with one at a time.
O’Harrow (1995) reports also that to give a woman a piece of fine jewelry in Vietnamese tradition is to help confirm her independence as a human being, and for a mother to hand over a piece of her jewelry to her daughter is a universally understood gesture, for which the subtext is "may this protect you from misery." Nowadays, divorce is increasingly easy to obtain.
Polygyny was widespread in both northern and central Vietnam, as was the taking of concubines.
The wedding ceremony was quite simple: The future husband and wife met, mutually offered themselves to each other, and chewed betel nut together.
So, within a family you will see different last names.
But the children will carry the father's last name.
Couples have traditionally been expected to live with the husband’s parents until they could afford a place of their own.
In the old days the bride was usually several years older than the groom.
Women kept their maiden names legally but used their husband's name formally.