The index closed 10.38 points higher after losing 8.75 points on Monday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) fell by 5.27% to VND14.06 trillion ($599.9 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 22 tickers gain.
PLX of fuel distributor Petrolimex rose 3.9%, with trading value hitting a 24-week high.
VNM of dairy giant Vinamilk gained 2.85 percent to its two-month high.
Other gainers included SSI of leading brokerage SSI Securities, up 2.83%, BID of state-owned lender BIDV, up 2.7%, and GAS of Petrovietnam Gas, up 1.8%.
Six blue chips bucked the trend, with SAB of brewer Sabeco losing 2.1%.
VIC of Vietnam's biggest conglomerate Vingroup fell 1.5%, and VRE of its mall operator branch Vincom Retail dropped 0.7%.
Foreign investors net sold for the third straight session to the tune of VND75.02 billion.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, rose 1.5% while the UPCoM-Index at the Unlisted Public Companies Market increased by 0.6% percent.