The index closed 21.61 points higher after gaining 6.51 points on Monday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) increased by 25.40% to VND11.75 trillion ($501.39 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 29 tickers gain.
HPG of steelmaker Hoa Phat Group led with a 6.9% surge.
It was followed by SSI of leading brokerage SSI Securities Corporation, up 5.2%.
MBB of lender MB gained 4.9%, and VRE of retail real estate arm Vincom Retail rose 4.5%.
SAB of brewer Sabeco was the only blue chip that dropped 0.8%.
Foreign investors were net buyers to the tune of VND795.93 billion, mainly buying HPG and STB of Ho Chi Minh City-based lender Sacombank.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 2.02% while the UPCoM-Index at the Unlisted Public Companies Market was up by 1.04%.