The index closed 14.35 points higher after falling 13.94 points Tuesday.
Trading on the Ho Chi Minh Stock Exchange (HoSE), on which the index is based, fell 25% to VND21.89 trillion (883 million).
The VN30 basket, comprising the 30 largest capped stocks, saw 26 tickers gained.
GVR of Vietnam Rubber Group surged 6.27%, followed by VPB of private lender VPBank, up 3.70%.
HDB of HDBank went up 2.76% and TCB of private lender Techcombank closed 2.57% higher.
Two blue chips fell. MSN of conglomerate Masan Group dropped 1.99% and SAB of brewer Sabeco closed 0.18% lower.
Foreign investors were net sellers to the tune of VND175 billion, mainly selling VND of brokerage VNDirect and MWG of electronics retail chain Mobile World.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, rose 0.51% while the UPCoM-Index for the Unlisted Public Companies Market gained 0.12%.