More heavy rains are forecast in the next few days
Efforts are underway to find the two workers and 14 local residents who were possibly washed away
"We are eating just one meal a day. Children are falling sick, and doctors are miles away."
Children were among those killed and searches were continuing for six people who have been reported missing.
More than 1.3 million people have been forced out of their homes, it said.
Sixteen of the dead were offering prayers in the mosque when it was swept away by the flood
Rescue teams were searching for 26 others who remained missing after the region
The dead people included a woman, 64, and her four grandchildren, aged 6, 7, 8, and 9 respectively
Heavy rain hit the region and sent flash floods to many provinces
Mountainous areas in northern Vietnam are at risk of flooding, flash floods and landslides
More than 2,900 flights had been canceled at U.S. airports by 7 p.m. EST (2400 GMT) on Monday, according...
Floods and landslides are forecast in the region. No human casualty has been reported.