Long An and host Trang An Ninh Binh lead the men's category after their first matches on Thursday at the Hoa Lu Volleyball Cup in Ninh Binh Province.
Long An defeated The Cong 3-0 and Ninh Binh beat PetroVietnam with the same score.
On the women's side, Vietsov Petro beat Tien Nong Thanh Hoa 3-0 while Thai Binh lost 0-3 to Lien Viet Bank.
Teams have taken part in a round-robin format competition with the top two teams heading to the final round.
The tournament will end on Sunday. — VNS