Update 2022-01-12: According to the Foreign Office on Tuesday (January 11), quarantine rules in Vietnam have been changed, with those eligible to enter the country only needing to be quarantined for 3 days if fully vaccinated or recovered and 7 days if unvaccinated. During quarantine, further PCR testing are conducted, followed by a period of self-monitoring.
Additionally, regions in Vietnam will be assigned a risk level, which will be accompanied by changes in travel guidelines to and from the region.