The index closed 4.63 points higher after gaining 11.60 points on Friday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) increased by 10.65% to VND23.54 trillion ($988.33 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 17 tickers gained.
SSI of leading brokerage SSI Securities Corporation led with a 3.6% rise, followed by GVR of Vietnam Rubber Group, up 2.1%.
BID of state-owned lender BIDV gained 1.9% and MWG of electronics retail chain Mobile World closed 1.7% higher.
Eleven blue chips fell. MSN of conglomerate Masan Group lost 2.7% and SSB of Southeast Asia Commercial Bank dropped 2.1%.
Foreign investors were net sellers to the tune of VND958.03 billion, mainly selling MSN and BVH of insurance company Bao Viet Holdings.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 0.55% while the UPCoM-Index at the Unlisted Public Companies Market was up by 0.19%.