The index closed 2.05 points higher after losing 0.67 points Monday.
Trading value went up 33% to VND15.73 trillion (US$633 million).
The VN30 basket, comprising the 30 largest capped stocks, saw 14 tickers gain.
HPG of steelmaker Hoa Phat Group led with a 2.1% rise, followed by VNM of dairy giant Vinamilk, up 1.6%.
HDB of HDBank went up 1.3% and TCB of private lender Techcombank closed 1% higher.
Twelve blue chips fell, including MWG of electronics retail chain Mobile World with a 1.7%.
Foreign investors were net sellers for the third day in a row to the tune of VND116 billion.
They mainly sold MWG and STB of Ho Chi Minh City-based lender Sacombank.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, fell 0.40%, while the UPCoM-Index for the Unlisted Public Companies Market dropped 0.02%.
Also Tuesday China's stock markets roared back from a week-long break and climbed to their highest levels in more than two years at the open, but lost steam after officials failed to inspire confidence in stimulus plans intended to turnaround a sputtering economy, Reuters reported.
The Shanghai Composite closed 4.6% higher while the blue-chip CSI300 rose 5.9% - big moves but well off gains of more than 10% seen early in a rollercoaster day where turnover hit a record 3.45 trillion yuan ($489 billion).
Hong Kong's Hang Seng index, catapulted to be the top-performing major market this year by its sharpest weeks-long rally in a generation, closed 9.4% lower - its heaviest fall since 2008.
Japan’s Nikkei Index fell 1%. Thailand Set IDX closed 0.29% higher.