Rescuers were still plucking people from treetops and the roofs of homes as floodwaters receded there on Friday, state media reported.
Multiple highways remained impassable on Saturday and 300,000 people were without power, after a blackout that initially affected more than a million, the Environment Ministry added.
Natural disasters have left 279 people dead or missing in Vietnam and caused more than US$2 billion ($3.5b) in damage between January and October, according to the national statistics office.
The Southeast Asian nation is prone to heavy rain between June and September, but scientists have identified a pattern of human-driven climate change making extreme weather more frequent and destructive.
– Agence France-Presse