The Tomb Raider beauty invited Nhan Dung to visit eight-year-old Pax at the Six Sense resort in Con Dao, where the family was staying.
It was the family's first visit to Vietnam since the actress adopted Pax from an orphanage near Ho Chi Min City.
A source tells Us Weekly, "It was a one-day visit. Nhan was looking forward to it after Pax had lived so many years abroad."
Jolie and her partner Brad Pitt have three biological children and have also adopted kids from Cambodia and Ethiopia.