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Try Opera browser with a built-in VPN. It might help. I remember it helped me once when I had trouble accessing a website from Vietnam.

I am still Vietnam but, I guess, the hostel of the internet provider of the hostel has an included VPN - everything works fine without VPN here.

Thanks. I will try it.
Happy Lunar New Year and enjoy Tet in Vietnam.

Thank you! Happy Lunar New Year! Enjoy the holiday!