It rose 15.9 points after losing 15.2 points Tuesday.
Trading on the Ho Chi Minh Stock Exchange (HoSE), on which the index is based, fell 16% to VND18.19 trillion ($746.18 million).
The VN30 basket, comprising the 30 largest capped stocks, saw 27 tickers gained.
SSI of leading brokerage SSI Securities Corporation led with a 6.8% rise, followed by GVR of Vietnam Rubber Group, up 4.7%.
MSN of conglomerate Masan Group rose 4.1% and SHB of Saigon Hanoi Commercial Bank closed 2.8% higher.
Two blue chips fell. SAB of brewer Sabeco dropped 1.6% and PLX of fuel distributor Petrolimex closed with a 1.5% decline.
Foreign investors were net buyers for the third straight session to the tune of VND310 billion, mainly buying GEX of electrical equipment maker Gelex Group and GAS of state-owned Petrovietnam Gas.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, rose 2.65% while the UPCoM-Index for the Unlisted Public Companies Market gained 0.34%.