The index closed 19.77 points lower after dropping 13.31 points in the previous session.
Trading on the Ho Chi Minh Stock Exchange decreased by 10% to VND13.63 trillion ($556.26 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 26 tickers fell.
GVR of Vietnam Rubber Group plunged 5.8%, followed by MWG of electronics retail chain Mobile World with a 4.7% decline.
FPT of IT giant FPT Corporation dropped 3.8% and BCM of Becamex Investment and Industrial Development closed 2.3% lower.
Foreign investors were net buyers to the tune of VND19 billion, mainly buying STB of Ho Chi Minh City-based lender Sacombank and IDC of construction firm Idico Corporation.
Four blue chips gained, led by VRE of retail real estate arm Vincom Retail with a 1.1% increase.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, dropped 2.72% while the UPCoM-Index for the Unlisted Public Companies Market fell 0.80%.