The index closed 0.63 points higher after gaining 2.41 points on Wednesday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) fell by 1.65% to VND8.71 trillion ($371.54 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 14 tickers unchanged.
VIB of Vietnam International Commercial Bank rose 2.8%, followed by GVR of Vietnam Rubber Group with a 2.1% gain.
VHM of property giant Vinhomes and VPB of private lender VPBank both went up 1.4%.
ACB of Asia Commercial Bank closed 1.2% higher.
Fourteen blue chips fell, with KDH of real estate firm Khang Dien House losing 4.6%.
PDR of Phat Dat Real Estate Development lost 1% and CTG of state-owned lender VietinBank fell 0.7%.
Foreign investors were net buyers to the tune of VND305.5 billion, mainly buying HPG of steelmaker Hoa Phat Group and VHM of property giant Vinhomes.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 0.13% while the UPCoM-Index at the Unlisted Public Companies Market was down by 0.25%.