check with the airline’s website rather than Google’s AI answer. It varies greatly on airlines operating between Thailand and Vietnam. Some airlines, ie Vietjet, offer upto 100kg checked luggage, but it depends on the route. AirAsia offer upto 50kg on some routes. Thai and Vietnam Airlines follow that American 23kg model shown in your screenshot. Hope that helps. It would be awful if you were denied access but your expensive stuff was here.