The four are of a family in Lang Chanh district.
The bodies of a 75-year-old woman and a 40-year-old man have been found, and the other two -- a 28-year-old woman and a four-year-old girl, have gone missing, Xinhua reported citing the authorities.
Besides the victims' house, two other houses were also swept away by the flood.
Over the past two days, Typhoon Son Tinh, which rapidly weakened into a tropical depression, has brought torrential rain inundating rivers and reservoir lakes in the central and northern regions.
According to the national Met office, heavy rains might last for days in these regions. More flash floods and landslides were likely to hit Thanh Hoa and Nghe An.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
