The index closed 6.77 points higher after gaining 11.34 points on Wednesday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) increased by 26% to VND10.73 trillion ($452.69 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 19 tickers gain.
GVR of Vietnam Rubber Group and STB of Ho Chi Minh City-based lender Sacombank both gained 4.5%.
VJC of budget airline Vietjet went up 3.6%, followed by VIB of Vietnam International Commercial Bank with a 2.4%.
Five blue chips fell, led by NVL of property developer Novaland Group with a 0.9% drop.
Foreign investors were net buyers for the third straight session to the tune of VND189.97 billion, mainly buying
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 0.17% while the UPCoM-Index at the Unlisted Public Companies Market was up by 0.14%.