Chief Executive John Lee has hailed his six-day trip to Southeast Asia for allowing him to "meet new friends and strength past relationships", with a total of 55 non-binding deals signed with three countries.

"[We signed] 12 with Laos, 13 with Cambodia and 30 with Vietnam, covering a wide range of cooperative areas, such as trade and economic partnership, investment, customs collaboration, education, cultural exchanges and tourism promotion," he told reporters in Ho Chi Minh City on Friday.

"We have confirmed the support from the three countries' governments for Hong Kong in joining the Regional Comprehensive Economic Partnership."

During an earlier luncheon with business leaders, Lee pledged to strengthen ties with Asean countries and reiterated his wish for Hong Kong to join the free trade pact.

"Hong Kong is making good use of the free trade agreement and investment agreement between Asean and Hong Kong to deepen our collaboration with Vietnam and other Asean countries. And we are eager to go beyond those free trade agreements," he said.

"We hope, too, to join RCEP, the Regional Comprehensive Economic Partnership. Through RCEP, I'm confident Hong Kong can make an even bigger contribution to the overall economic growth of Vietnam, Asean and the larger Asian region."

Lee also met Vietnamese politicians on his last day, including the chairman of the Ho Chi Minh City People's Committee, Phan Van Mai.

Other visits included a trip to a Hong Kong-owned garment manufacturing factory, where the firm's chief executive officer was quoted as saying the company will continue to keep its headquarters in the SAR and attract talent from Asean countries to the territory.

The SAR delegation was returning to Hong Kong on Friday evening.