What language should I speak when I go to Vietnam? Will I speak Mandarin or will they all speak English?

It depends on where you go in Vietnam. If you go to a big city, the first thing you need to speak is Chinese. Because in big cities, there are more Chinese people and more Chinese people do business. Good communication, good work and good communication. Vietnamese people don’t speak English very well. There are very few English speakers in Vietnam, and their speaking skills are not standard. You don’t understand Vietnamese people when they speak English, and Vietnamese people don’t understand you when you speak English. If your body language is good, just use body language. This is the most direct and cost-effective way.