The pair have been treated at a field hospital in the northern province of Quang Ninh.
They include a female patient numbered 52, aged 24, who was hospitalized on March 13.
The other is male patient 149, aged 40, hospitalized on March 25.
So far, Viet Nam has confirmed 268 infection cases, of whom 256 have reported since March 6./.
By Huong Giang