The index opened in the green and continued sideways throughout the day. It closed 8.65 points higher after losing nearly 9 points Monday.
Trading value on the Ho Chi Minh Stock Exchange (HoSE), on which the index is based, rose nearly 12 percent to VND26.31 trillion ($1.15 billion). This was its third session in the VND20 trillion range.
The VN30 basket, comprising the 30 largest capped stocks, saw 17 tickers in the green, led by GVR of Vietnam Rubber Group with a 4.5 percent gain to the highest in six weeks.
VIC of biggest private conglomerate Vingroup closed 2.9 percent higher, and KDH of Khang Dien House Trading and Investment rose 2.3 percent.
Other gainers include PNJ of Phu Nhuan Jewelry, up 1.9 percent, and TPB of private lender TP Bank, up 1.3 percent.
Eleven blue chip stocks fell, with PLX of state-owned fuel distributor Petrolimex falling 1.6 percent, and MBB of state-owned lender MB Bank losing 1.2 percent.
Foreign investors were net buyers for the first time in three sessions to the tune of VND155.3 billion with focus on MBB of state-owned lender MB Bank and NLG of real estate developer Nam Long Investment.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, rose 0.71 percent while the UPCoM-Index for the Unlisted Public Companies Market gained 0.16 percent.