The index closed 1.36 points higher after gaining 12.44 points in the previous session.
Trading on the Ho Chi Minh Stock Exchange increased by 27% to VND18.74 trillion ($763.50 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 14 tickers gained.
HPG of steelmaker Hoa Phat Group led with a 1.8% rise, followed by ACB of Asia Commercial Bank, up 1.3%.
HDB of HDBank gained 1.2% and SSI of leading brokerage SSI Securities Corporation went up 0.7%.
Ten blue chips fell, including GVR of Vietnam Rubber Group with a 1.2% loss.
Foreign investors were net buyers to the tune of VND471 billion, mainly buying PC1 of construction firm PC1 Group and CTG of state-owned lender VietinBank.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, rose 0.13%, while the UPCoM-Index for the Unlisted Public Companies Market went up 0.29%.