The index closed 10.49 points higher after gaining 6.98 points on Monday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) fell by 10.92% to VND15.64 trillion ($665.90 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 24 tickers gain.
SSI of leading brokerage SSI Securities Corporation gained 4.4%, followed by MBB of lender MB with a 3.3% increase.
TCB of the largest private lender Techcombank closed 2.5% higher and VHM of property giant Vinhomes went up 2.4%.
Six blue chips fell. Both POW of electricity producer Petrovietnam Power Corporation and TPB of private TPBank lost 1.1%.
Foreign investors were net buyers to the tune of VND66.79 billion, mainly buying SSI and VND of brokerage VNDirect.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 0.95% while the UPCoM-Index at the Unlisted Public Companies Market was up by 0.38%.