The index went up 7 points after rising 0.9 points Wednesday.
Trading on the Ho Chi Minh Stock Exchange (HoSE), on which the index is based, gained 7.5% to VND25.87 trillion ($1.04 billion).
The VN30 basket, comprising the 30 largest capped stocks, saw 18 tickers gained.
TCB of the largest private lender Techcombank led with a 5.4% rise, followed by STB of Ho Chi Minh City-based lender Sacombank, up 3.6%.
VHM of property giant Vinhomes gained 1.9% and SSI of leading brokerage SSI Securities Corporation closed 1.7% higher.
Seven blue chips fell. PLX of fuel distributor Petrolimex and VRE of retail real estate arm Vincom Retail both lost 1.2%.
Foreign investors were net sellers to the tune of VND1.3 trillion, mainly selling VHM and VRE of retail real estate arm Vincom Retail.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, rose 0.44% while the UPCoM-Index for the Unlisted Public Companies Market rose 0.33%.