According to Vietnam National Administration of Tourism, The Pilot plan to reopen for international visitors to Phu Quoc is only applied to international tourists through a package tour program by travel agencies in the first phase.
It does not apply to people entering for other purposes. The target markets are beach vacation tourists, golf players, tourists from potential markets and safety from pandemic.
Phu Quoc island Chensea Resort
Holiday makers in Phu Quoc island – Chensea Phu Quoc resort

International tourists must have vaccination certificate as regulation or certificate of COVID-19 recovery; negative test result for COVID-19; registered to package tour of travel agencies and have a contract of health insurance and travel insurance. Children under 12 years old are allowed to accompany their parents, or guardians who have been fully vaccinated according to regulations.

Ministry of Health is assigned to coordinate with Ministry of Information and Communications, Ministry of Public Security and Ministry of Foreign Affairs to provide guidance on vaccination certificate; prioritize vaccine allocation for Phu Quoc.

Ministries of Culture, Sports and Tourism, Health, Public Security, National Defense, Foreign Affairs, Transport, Information and Communication and related agencies have the responsibility of guiding and supporting Kien Giang Provincial People’s Committee to implement the pilot plan.

Source: https://vietnamtourism.gov.vn