PHNOM PENH, June 15, 2016 (Xinhua) -- Cambodian Prime Minister Samdech Techo Hun Sen (R) shakes hands with visiting Vietnamese President Tran Dai Quang in Phnom Penh, Cambodia, on June 15, 2016. Cambodian and Vietnamese leaders on Wednesday pledged to expand bilateral cooperation in humanitarian activities for mutual benefits, a Cambodian senior official said. (Xinhua/Sovannara)