The index closed 16.2 points higher after gaining 28.6 points on Wednesday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) fell by 22.4% to VND8.90 trillion ($369.06 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 23 tickers gain, led by three banks.
ACB of Asia Commercial Bank gained 6.7%, followed by BID of state-owned lender BIDV, 6.6%, and CTG of state-owned lender VietinBank, 5.9%.
Other gainers included VRE of retail real estate arm Vincom Retail, HPG of steelmaker Hoa Phat Group, and STB of Ho Chi Minh City-based lender Sacombank.
Three blue chips fell: MSN of conglomerate Masan Group dropped 3%, NVL of real estate developer Novaland Group lost 0.7% and PLX of fuel distributor Petrolimex went down 0.6%.
Foreign investors were net buyers to the tune of VND449.94 billion, mainly buying VNM of dairy giant Vinamilk, DGC of Duc Giang Chemicals Group and HPG.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 0.59% while the UPCoM-Index at the Unlisted Public Companies Market was up by 0.04%.