Entry Restrictions to Vietnam
From 25 March 2020 until 31 March 2020, Vietnamese from foreign countries are not allowed to enter Ho Chi Minh. Airlines can still operate as ferry flight to transport passengers from city.
This is in addition to the restriction implemented on 22 March 2020, on the temporary entry suspension to all foreigners, people with a Vietnamese visa exemption certificate as well as overseas Vietnamese and their spouses and children who have been granted with certificate of visa exemption.
Passengers holding diplomatic or official passports entering Vietnam for diplomatic or official purpose are allowed to enter the country subject to mandatory medical declaration and to a 14-days self-isolation.
For further details, please see the Vietnamese government’s website http://mt.gov.vn/vn/tin-tuc/65531/thuc-hien-ket-luan-cua-thu-tuong-chinh-phu-tai-thong-bao-so-118-tb-vpcp-ngay-21-3-2020-cua-van-phong-chinh-phu-ve-phong-chong-dich-covid-19.aspx
See if your flight is affected here- https://www.malaysiaairlines.com/us/en/advisory/flight-adjustments-due-to-travel-bans.html
Last updated 25 March 2020, 1300hrs (GMT+8)