The index closed 3.11 points higher after gaining 2.04 points on Wednesday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) increased by 33.03% to VND11.04 trillion ($470.08 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 17 tickers gain.
HDB of HDBank led with a 3.3% gain, followed by VHM of property giant Vinhomes, up 3.2%.
STB of Ho Chi Minh City-based lender Sacombank went up 2.6% and PLX of fuel distributor Petrolimex gained 2.5%.
Eight blue chips fell.
POW of electricity producer Petrovietnam Power Corporation and TCB of the largest private lender Techcombank both lost 1.1%.
Foreign investors were net sellers to the tune of VND412.33 billion, mainly selling STB and SSI of leading brokerage SSI Securities Corporation.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 0.18% while the UPCoM-Index at the Unlisted Public Companies Market was down by 0.31%.