The Vietnam News Agency reports 64 others were injured in the country's central region, where storm damage was estimated at about $45 million.
It said Nghe An was the hardest hit province in terms of both the number people affected and property losses.
Ten Vietnamese fishermen were rescued in rough seas after the storm sunk their fishing trawler, an official said Thursday.
The men were found floating in traditional round woven bamboo boats, in which they took refuge after the sinking.
Mindulle dumped as much as 11 inches of rain in some areas after coming ashore near the city of Vinh late Monday, according to government meteorologists.
Tropical Storm Mindulle Track
Satellite Loop Data: CIMSS