There are six tones in Vietnamese including: low constricted tone (thanh nặng), falling tone (huyền), level tone (ngang), rising tone (sắc), falling rising tone (hỏi) and high rising tone (ngã). Because southern Vietnamese makes falling rising tone and high rising tone the same, we will work on five tones only.
You may find them confusing and too difficult to pronounce. However, Vietnamese tones are actually similar to intonation in English. And you still use them in everyday English.