The index closed 12.5 points higher after losing 4.8 points Monday.
Trading on the Ho Chi Minh Stock Exchange, on which the index is based, dropped 16% to VND20.4 trillion ($817 million).
The VN30 basket, comprising the 30 largest capped stocks, saw 22 tickers went up.
MWG of electronics retail chain Mobile World led with a 5.6% surge, followed by BID of state-owned lender BIDV, up 3.7%.
VRE of retail real estate arm Vincom Retail gained 2.5% and CTG of state-owned lender VietinBank closed 2.2% higher.
Four blue chips fell, including VCB of state-owned lender Vietcombank with a 0.6% decline.
Foreign investors were net buyers to the tune of VND271 billion, mainly buying MWG and SBT of sugar producer Thanh Thanh Cong – Bien Hoa Jsc.
The HNX-Index for stocks on the Hanoi Stock Exchange, home to mid and small caps, rose 0.96% while the UPCoM-Index for the Unlisted Public Companies Market went up 0.05%.