In the women's doubles category, Le Thu Huyen and Pham NhuThao beat Marie Batomene and Anne Tran of France 21-16, 21-9 in the final on August 20.
Do Tuan Duc and Pham NhuThao also won gold in the mixed doubles class by default after their Danish opponents were forced to withdraw due to injury.
Le Thu Huyen won a bronze in the women's singles the day before.
The three athletes will take part in the Yonex Slovak Open from August 27 to 30.