That certainly hasn’t been easy for you — was the male Google Assistant voice working before or is this the first time trying it out? What country are you located and where did you buy your Nest Mini? What is the error message when trying to change it?
Here are the complete steps to take:
Let me know how it goes.
Sweet! We're happy to know that the issue is now resolved. The Vietnamese language is not supported on any of our Google Home/Nest speakers and displays. We're always looking for ways to improve -- we'll take this as feedback. You can also send feedback using your device by saying, "Hey Google, send feedback." Visit this link for more steps.
Let us know if you have additional questions or concerns about your device, otherwise; we'll close the thread after 24 hours.