How to fix special character in URL

[Hoa Dev]

HI, im test blog in Vietnamesee and it have spacial character in URL, how i can fix it.
Thank you so much!
https://nifty-yalow-780b90.netlify.com/kết-thuc-blackfriday-2017-d

[Hays Clark]

@TheHoa I am no expert on Vietnamese Unicode, this would be a good question for StackOverflow. Good luck!