The index closed 34.23 points higher after gaining 23.75 points on Friday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) increased by 64% to VND15.94 trillion ($642.74 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 23 tickers gain.
Seven blue chips closed at ceiling price, including GAS of state-owned Petrovietnam Gas, TCB of the largest private lender Techcombank and HPG of steelmaker Hoa Phat Group with a 7% rise.
Other notable gainers included MBB of lender MB and MWG of electronics retail chain Mobile World, both went up 6.2%.
Five blue chips fell, including PDR of Phat Dat Real Estate Development with a 7% fall.
Foreign investors were net buyers to the tune of VND1.68 trillion.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 3.70% while the UPCoM-Index at the Unlisted Public Companies Market was up by 2.37%.