The index closed nearly 16 points higher after gaining 3 points on Tuesday.
Trading on the Ho Chi Minh Stock Exchange (HoSE) increased by 27% to VND8.26 trillion ($348.16 million).
The VN-30 basket, comprising the 30 largest capped stocks, saw 25 tickers gain.
STB of Ho Chi Minh City-based lender Sacombank surged 6.9%, followed by HPG of steelmaker Hoa Phat Group with a 4.5% rise.
HDB of HDBank and SSI of leading brokerage SSI Securities Corporation both went up 3.8%.
Four blue chips closed in the red.
NVL of property developer Novaland Group lost 3.3% and MSN of conglomerate Masan Group fell 1.8%.
Foreign investors were net sellers for the 11th straight session to the tune of VND301.66 billion, mainly selling VHM of property giant Vinhomes and SSI.
The HNX-Index at the Hanoi Stock Exchange, where mid and small caps list, was up 2.20% while the UPCoM-Index at the Unlisted Public Companies Market was up by 0.26%.