The index closed 4 points higher after losing 1.4 points on Friday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) increased by 1.52% to VND15.80 trillion ($675.49 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 14 tickers gain.
VPB of private lender VPBank rose 2.2% to the highest since June 29. TCB of the largest private lender Techcombank gained 2.1% to a three-month high.
Other gainers included PLX of fuel distributor Petrolimex, GAS of state-owned Petrovietnam Gas and GVR of Vietnam Rubber Group.
Thirteen blue chips fell, with VIC of biggest private conglomerate Vingroup losing 1.2% and VJC of budget airline Vietjet falling 1%.
Foreign investors were net sellers to the tune of VND99.23 billion, mainly selling HPG of steelmaker Hoa Phat Group and VNM of dairy giant Vinamilk.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 0.48% while the UPCoM-Index at the Unlisted Public Companies Market was up 1.10%.