The index closed 0.33 points higher after gaining 13.13 points on Monday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) fell by 13.41% to VND9.34 trillion ($398.04 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 13 tickers gain.
TPB of private TPBank gained 1.3%, followed by GAS of state-owned Petrovietnam Gas with a 1.1% increase.
BID of state-owned lender BIDV and HPG of steelmaker Hoa Phat Group both went up 0.9%.
Fifteen blue chips were in the red.
VJC of budget airline Vietjet declined by 0.9% and HDB of HDBank lost 0.8%.
Foreign investors were net sellers to the tune of VND230.32 billion, mainly selling CTG of state-owned lender VietinBank and KBC of industrial real estate developer Kinh Bac City.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 0.49% while the UPCoM-Index at the Unlisted Public Companies Market was down by 0.05%.