The floods forced 64,500 people from their homes in Quang Ngai province, with three dead and three missing, provincial officials said. The military and police are rushing aid and food to villagers cut off by the floodwaters, they said.
Another 16,600 people were evacuated from their homes in the neighbouring province of Quang Nam, where one person died and another was missing, disaster official Nguyen Hoai Phuong said.
"The flooding was widespread in the province, where some 60 percent to 80 percent of the areas of Hoi An city and two other districts were submerged," Phuong said, adding that the floodwaters were slowly receding.
State media reported that three people were killed and two others missing in three other central provinces.