What are Vietnamese Martial Arts?

What are Vietnamese Martial Arts? Are there many styles? How are they different?
This video answers these questions and presents some of the most popular styles.
You can buy 'The Martial Arts of Vietnam' for even more information, great stories and images from YMAA Publishing or Amazon.com at the links below:
ymaa.com/publishing/book/mart...
www.amazon.com/Martial-Arts-V...