The index closed 7.9 points higher after Monday’s gain of 18.9 points.
Trading on the Ho Chi Minh Stock Exchange, on which the index is based, rose 10% to VND25.24 trillion (US$972 million).
The VN30 basket, comprising the 30 largest capped stocks, saw 13 tickers gained.
VHM of property giant Vinhomes led with a 7% rise, followed by STB of Ho Chi Minh City-based lender Sacombank, up 5.8%.
VIC of private conglomerate Vingroup rose 2.2% and MSN of conglomerate Masan Group closed 1.4% higher.
Twelve blue chips fell. GVR of Vietnam Rubber Group dropped 1.4% and LPB of Fortune Vietnam Bank closed 1.2% lower.
Foreign investors were net sellers to the tune of VND480 billion, mainly selling FPT of tech giant FPT Corporation and VIC.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, fell 0.11%, while the UPCoM-Index for the Unlisted Public Companies Market closed 0.15% higher.