Vietnamese language
The spoken language of Vietnam changes in each province. Even in different cities in the same province, and even different neighborhoods in the same city, Vietnamese dialects can be very different from each other. Usually, the greater the distance between provinces, the stronger the difference. There are many dialects in Vietnamese, including Hanoian, Saigonese, Danang, Hue, and Nghe An. Some dialects are close enough to each other that speakers of said dialects can understand each other without many problems. However, other dialects are so different that even native speakers of Vietnamese have problems understanding, such as the Hue and Nghe An dialects. The national education for all of Vietnam now uses the Hanoian dialect, but each ethnic tribe may still use a different dialect, language, or vocabulary.