According to the UN, from 2008-2018 over 18,000 Vietnamese citizens a year married foreigners. The vast majority of them are women, and many find their foreign husbands through special matchmaking agencies. Thuong Le from BBC Vietnamese has been looking into this profitable and controversial business.

Produced by Caroline Ferguson, Hannah Dean and Alice Gioia.

(Photo: Faranak Amidi. Credit: Tricia Yourkevich.)