Twelve people and 33 fishing boats were lost near Phu Quoc Island due to the recent monsoon.
The island off the Mekong Delta's Kien Giang Province also reported losing contact with one boat.
Thirty-eight seafood farms and seven houses were damaged, causing a total loss of tens of billions of dong.
Since the strom, seven of the ships have been retrieved.
In the nearby Can Tho, lightning killed one person and heavy rains have crushed and flooded several houses, according to information from the Central Flood and Storm Prevention Steering Committee.