He was followed by Yoeun Phi Yuth of Cambodia and Nguyen Minh Luan of Premium Cycling Vinh Long.
After stage four, Quang Van Cuong from Gao Hat Ngoc Troi An Giang remained the tour leader, clocking 6:48.34.
The green jersey belongs to Yuth with 49 points.
Gao Hat Ngoc Troi An Giang are on top of the team ranking. Cambodia and Premium Cycling Vinh Long came second and third, respectively.
The fourth stage on May 13 is from Kien Tuong to Hong Ngu Town of Dong Thap province on 108km.