The index closed 1.79 points higher after gaining one points in the previous session.
Trading on the Ho Chi Minh Stock Exchange increased by 8% to VND17.111 trillion ($703.29 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 14 tickers gained and 16 fell.
The top gainers included VCB of state-owned lender Vietcombank, up 4.0%, ACB of private lender Asia Commercial Bank, up 2.3%, and MSN of conglomerate Masan Group, up 2.1%.
HDB of HDBank closed 2.0% lower.
VPB of private lender VPBank and HPG of steelmaker Hoa Phat Group both went down 1.8%.
Foreign investors were net seller to the tune of VND356 billion, mainly selling FUESSVFL exchange-traded fund and SSI of securities firm SSI, and buying VCB and MWG of electronics retail chain Mobile World.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, fell 0.45%, while the UPCoM-Index for the Unlisted Public Companies Market went up 0.46%.