The index closed 0.68 points higher after gaining 2.95 points in the previous session.
Trading on the Ho Chi Minh Stock Exchange decreased by 17% to VND17.32 trillion ($707 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 20 tickers gained and 10 fell.
BVH of insurance company Bao Viet Holdings went up 3.7%, followed by POW of electricity producer Petrovietnam Power Corporation, up 2.2%.
BCM of Becamex Investment and Industrial Development rose 2% and PLX of fuel distributor Petrolimex closed 1.7% higher.
Seven blue chips fell. BID of state-owned lender BIDV and GVR of Vietnam Rubber Group both lost 1.9%.
Foreign investors were net buyers to the tune of VND149 billion, mainly buying STB of Ho Chi Minh City-based lender Sacombank and IDC of construction firm Idico Corporation.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, rose 0.56%, while the UPCoM-Index for the Unlisted Public Companies Market went up 0.47%.