Malaysian Prime Minister Najib Razak on Friday expressed his "sincere appreciation" to Vietnam for their help in the search for missing Malaysia Airlines Flight 370.
Razak made the comment during an official visit to Hanoi to strengthen relations between the two countries.
Razak had an hour-long talk with Prime Minister Nguyen Tan Dung on cooperating in various fields including trade, agriculture, energy and the military.
Meanwhile, the search continues for Flight MH370 after it vanished from radar on 8 March on a flight from Kuala Lumpur to Beijing with 239 people on board.
Vietnam had conducted a week-long search and rescue mission for the plane in the South China Sea before data showed the Boeing jetliner 777 changed course and flew along a southern corridor in the Indian Ocean.
Razak is scheduled to meet Vietnamese President Truong Tan Sang and Communist Party chief Nguyen Phu Trong later on Friday.