The index closed 1.3 points higher, having gained nearly 16 points in the previous session.
Trading on the Ho Chi Minh Stock Exchange, on which the index is based, fell 0.8% to VND23.07 trillion ($907 million).
The VN30 basket, comprising the 30 largest capped stocks, saw 14 tickers gained.
TPB of private TPBank led with a 3% increase, followed by MBB of lender MB, up 1.9%.
SHB of Saigon Hanoi Commercial Bank rose 1.7% and CTG of state-owned lender VietinBank went up 1.2%.
Fifteen blue chips fell.
PLX of fuel distributor Petrolimex and SAB of brewer Sabeco both dropped 2.1%.
Foreign investors were net sellers for the sixth straight session to the tune of VND1.4 trillion.
They mainly sold FPT of IT giant FPT Corporation and VHM of property giant Vinhomes.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, rose 0.02% while the UPCoM-Index for the Unlisted Public Companies Market dropped 0.12%.