The new patients were recorded in the epicenter Bac Giang and the nearby Lang Son Province.
Bac Giang recorded 23 more cases who are all linked to its industrial parks.
The other case in Lang Son is a 49-year-old man who has had contact with a Covid-19 patient and had already been isolated before testing positive.
The fourth Covid-19 wave broke out in Vietnam one month ago and so far, the nation has recorded cases in 30 cities and provinces.
Bac Giang continues to have the most infections, with 1,543 cases, followed by its neighbor Bac Ninh with 524 cases.
Most of the patients are factory workers in the two provinces' industrial parks.