If you travel frequently, having something like this would help: https://www.amazon.com/NEWVANGA-International-Universal-Worldwide-Charging/dp/B01FO4W5W2/ref=mp_s_a_1_1_sspa?keywords=international+adapter&qid=1552090809&s=gateway&sr=8-1-spons&psc=1
In Việt Nam, outlets at modern places work fine with American plugs though older places usually don't have the grounded outlet. You could buy something like this to bypass the earth pin http://gakutomo.com/wp-content/gallery/100-yen-shop/img_0721.jpg This small adapter should cost less than a dollar each in Việt Nam.
That’s an Indian Plug. Where did you get it from? This will help or get something similar
