Two Vietnamese fishermen were saved Friday from a shipwreck off the coast of Thanh Hoa Province.
Two other crew members have been confirmed dead and two remain missing.
The six fishermen clung to floating wreckage for more than 20 hours, according to the ship's owner Le Nhu Thanh, who survived.
Thanh said that strong waves capsized their boat while they sped towards shore on Thursday morning.
Another survivor, Le Van Cuong, said they had tried to keep the bodies of Le Van Dien, 68, and Vu Nhu Muoi, 20, with them after they died from exhaustion.
Search and rescue officials continue to look for the missing --Muoi's twin brother Vu Nhu Chinh and Truong Nhu Thanh, 18, who floated away during the night.
On October 15, another Thanh Hoa ship sank but none of the nine crew members have been found.