For the 2018 PC release, patches are available through community translation groups like The Red Team and Game Thuần Việt . : Download the .rar file containing the Vietnamese patch.
Extract the files into the main game installation directory. Launch the game and navigate to > Language . Change the Text Language to Vietnamese. god-of-war-tieng-viet-rar
To see a walkthrough of the setup process for God of War Ragnarök in Vietnamese, watch this video: For the 2018 PC release, patches are available