Vietnam Airlines has moved its operations to Siem Reap Angkor International Airport in Siem Reap, Cambodia, as Siem Reap Airport located in the same province was officially closed on October 16.
Source: VNExpress International,
https://e.vnexpress.net/news/travel/vietnam-airlines-moves-to-siem-reap-angkor-international-airport-4665576.html