The index closed 1.1 points higher after rising 1.7 points Friday.
Trading on the Ho Chi Minh Stock Exchange (HoSE), on which the index is based, dropped 18% to VND11.5 trillion ($473.25 million).
The VN30 basket, comprising the 30 largest capped stocks, saw 16 tickers gained.
GVR of Vietnam Rubber Group led with a 4.6% increase, followed by VRE of retail real estate arm Vincom Retail, up 2.9%.
VNM of dairy giant Vinamilk rose 1.9% and MSN of conglomerate Masan Group closed 1.4% higher.
Twelve blue chips fell. TPB of private TPBank dropped 2% and GAS of state-owned Petrovietnam Gas closed 1.5% lower.
Foreign investors were net sellers to the tune of VPB of private lender VPBank and VIC of private conglomerate Vingroup.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, gained 0.18% while the UPCoM-Index for the Unlisted Public Companies Market dropped 0.10%.