Authorities in the southern province of Kien Giang, home to Phu Quoc, have proposed extending visa-free stay on the island from the current 30 days to six months.
Source: VNExpress International,
https://e.vnexpress.net/news/travel/phu-quoc-eyes-6-month-visa-waiver-to-lure-overseas-tourists-4602707.html