Among the victims were a newborn baby and a one-year-old child who died in a landslide in the mountains of northwest Vietnam.
At least 24 people have been killed and 299 injured in Vietnam amid landslides and flooding triggered by Typhoon Yagi.
The typhoon was Asia's most powerful storm this year and made landfall on Vietnam's northeastern coast on Saturday after wreaking havoc in China and the Philippines.
Among the victims were six people, including a newborn baby and a one-year-old child, who died in a landslide in the Hoang Lien Son Mountains in northwest Vietnam.
Their bodies were discovered on Sunday, a local official told AFP news agency.
Other victims included a family of four who died after heavy rains caused a hillside to collapse onto a house in Vietnam's mountainous northern Hoa Binh province, state media reported.
The Vietnamese government said the storm disrupted power and telecommunications in several parts of the country, mainly in Quang Ninh and Hai Phong in the northeast.
The weather agency warned of more flooding and landslides on Monday, saying rainfall had ranged from 208 mm to 433 mm (8.2 inches to 17 inches) in various parts of the region over the past 24 hours.
“Floods and landslides are damaging the environment and threatening people’s lives,” the National Hydrometeorological Forecasting Centre said in a report.
Yagi weakened to a tropical depression on Sunday, but several areas of the port city of Hai Phong were under half a meter (1.6 feet) of water and power was out.
In Ha Long Bay, a UNESCO World Heritage site about 70 kilometres (43 miles) from the city, the disaster management authority said 30 boats sank after being hit by strong winds and waves.
The typhoon also damaged nearly 3,300 homes and more than 120,000 hectares (296,500 acres) of crops in the north of the country, the authority said.
Before reaching Vietnam, Yagi devastated southern China and the Philippines, killing at least 24 people and injuring dozens more.
Typhoons in the region are now forming closer to shore, intensifying more quickly and staying over land longer due to climate change, according to a study published in July.
