In Vietnam, the engagement is a festive ceremony involving the fiancé's and fiancée's families, and arranged in advance by the parents. The engagement is considered very important, and in some areas, even more important than the wedding.

Well before the engagement day, each family chooses two representatives from their side. The representatives can be family members or friends, but are usually a married couple who have a happy family of their own. Although there are two representatives, the man is the one who actually does the  representation, requesting for the fiancée's hand in marriage on behalf of the fiancé's family, exchanging gifts, and controlling the flow of the ceremony.

In addition to selecting their representatives, the families get together to negotiate the dowry and a date and time for the ceremony.  Traditionally, the date and time are chosen based on the fiancé's and fiancée's dates and hours of birth, but in a fast-paced society, such as that of the United States, it is usually a matter of convenience.

Several days prior to the engagement day the fiancé's parents prepare gifts to proffer to the fiancée's family.  These gifts include betel leaves and areca nut fruits (trau cau), wine, tea, husband-wife cake (banh phu the), sticky rice, other foods, and jewelry.  They are placed in trays and wrapped in red plastic paper, with the belief that red will bring good luck.  In addition to the other foods, a whole pig is roasted and placed in a large tray, to be carried to the fiancee's home by two young men.  Meanwhile, the fiancé is getting the ring ready, and the fiancée, preparing herself for the ceremony.

On engagement day, the fiancé's family bear the gifts to the fiancée's home and is greeted by the fiancée's family. Once everyone is inside, the fiancé's representative asks the other representative for the fiancée's hand in marriage on behalf of his party.  The fiancée's representative graciously accepts the gifts and presents the fiancée to her in-laws to be united.  Together, the engaged couple prays in front of the family altar and asks their ancestors for approval.  When the prayer is finished, the fiance places the engagement ring on his fianced's finger.

Following the ring presentation, the representatives formally introduce their party's family members according to his or her family role.  From this moment forward, the fiancé and fiancée are official members of their in-law family, and should refer to their in-law family members by their respective roles - "dad", "mom", "uncle", "aunt", and so forth. The parents in return accept a new son or daughter into their own family.  After the ceremony, the families celebrate the momentous occasion with a feast organized by the fiancée's family.  It is expected that half of the food gifts received be unwrapped and shared before the fiance's family leaves.  

The day after the engagement, the engaged couple and their parents visit their neighbors, friends, co-workers, and relatives who could not attend the ceremony. They bring some betel leaves and areca nuts, tea and/or wines to spread the good fortune.