At least 98 people were reported dead and 20 others are missing after flash floods battered the central region from Tuesday.
People in the flood-hit central region receive clean water and food from relief groups
Thousands of houses, crops and fish farming areas were destroyed by the floods and typhoon Marinae which had swept through the provinces the day before.
On Wednesday, 16,000 people in Phu Yen Province were evacuated from high-risk areas.
Sections of rail and the national highway running through the central provinces were either swept away or submerged under at least a meter of floodwater.
However, airlines have resumed flights to transport thousands of bus and rail passengers who were caught in the hardest-hit provinces of Phu Yen, Binh Dinh, Khanh Hoa and Gia Lai.
Transport inaccessibility has left thousands of homeless locals, especially in remote areas, in desperate shortages of clean water and food.
That situation will likely last for a few more days, until roads are completely repaired.
Pham Van Hoa, director of the state-run road repair company in Phu Yen Province, told Tuoi Tre it will take his agency from two to three days to repair the roads.
Compounding the problem, dozens of hydroelectricity power plants in the region have continued to release water from their reservoirs, keeping floodwaters dangerously high.