At least 20 people had died and one listed missing as of Sunday night in the latest round of flooding triggered by torrential rains in the central region since Wednesday.
Ha Tinh province suffered the highest death toll with ten so far, followed by Nghe An with eight, while the other two came from Quang Binh, the Central Committee for Storm and Flood Control said in its online report.
Meanwhile, Ha Tinh's news website baohatinh Monday reported some 20 people were missing after a bus carrying nearly 40 people was swept away in Xuan Lam Commune early in the morning.
Others managed to escape, the report said, adding rescue efforts were ongoing.
More than 150,000 houses have been submered in the second round of flooding to hit the central coast within one month, it said.
Local newspaper Tuoi Tre Monday quoted Nguyen Van Binh, deputy general director of Hanoi Railways Transport Company as saying that as of Sunday afternoon, 12 trains carrying around 3,000 passengers have been delayed by the floods.
Many sections of the railway between Nghe An province's Vinh Town and Quang Binh province's Dong Hoi Town were flooded or collapsed, according to the news source.
As heavy rains continued in Nghe An and Thanh Hoa provinces, water levels in local rivers will keep increasing, they had reached alarming levels in other provices as well, the National Center for Hydro-Meteorological Forecasting (NCHMF) said Sunday.
In related news, super typhoon Megi with winds blowing at 220 kilometers per hour the highest level on the Beaufort scale measuring wind's speed will enter the East Sea Monday evening, the NCHMF said.
Strengthening from a tropical depression last Wednesday, Megi has been listed as the strongest storm so far in the Pacific's 2010 typhoon season, as also the strongest tropical cyclone recorded worldwide in 2010 by several international agencies.
Vietnam's central coast was already hit hard by heavy rains late last month, and ensuing floods killed at least 66 people and injured 86. Another 18 people are still listed as missing. Property losses were estimated VND2.562 trillion (US$131.4 million) in total.