Although Duan of Sai Gon Plant Protection 1 didn't finish in the top three he still had the overall best time of 35:05.52 after 11 stages to stay in yellow.
Rolling in just 1sec behind Duan, Bui Minh Thuy of ADC-Vinh Long Television is in second place overall, with his teammate Phuc in third, 22sec behind the leader.
Anh will continue wearing the green jersey for sprinting after amassing 50 points in the first 11 stages of the race.
In the race for the red jersey, the King of the Mountain title, An Giang Plant Protection's Trinh Phat Dat reached the summit of Ca peak first to win five points, but Duan's teammate, Mai Nguyen Hung, had enough overall points to stay in red.
Team rankings remained unchanged from Wednesday, with Domesco Dong Thap on top with a combined time of 105:19.46. Sai Gon Plant Protection 1 and An Giang Plant Protection rounded out second and third place.