The index closed 4.89 points higher after gaining 2.98 points on Wednesday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) fell by 10.16% to VND12.34 trillion ($524.99 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 19 tickers gain.
VPB of private lender VPBank led with a 6.7% rise to ceiling price.
It was followed by MBB of lender MB, up 4.4%, and TCB of the largest private lender Techcombank, up 2.4%.
MSN of conglomerate Masan Group gained 2.3%, and VIB of Vietnam International Commercial Bank rose 1.9%.
Eight blue chips fell, with PDR of Phat Dat Real Estate Development losing and VHM of property giant Vinhomes both falling 4.3%.
Foreign investors were net buyers to the tune of VND319.06 billion, mainly buying VND of brokerage VNDirect and DXG of real estate developer Dat Xanh Group.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was down 0.12% while the UPCoM-Index at the Unlisted Public Companies Market was up by 0.67%.