Vietnamese is not related to Chinese - but how do we know that?

Youtube link: https://youtu.be/eLCeOgtboyg Become a student at our school, online or in-person: https://learnvietnamesewithannie.com/classes  Try our interactive PREMIUM lessons for FREE:  https://learnvietnamesewithannie.com/podcast/free-sample-lesson/?page=2  Get our books on Amazon: https://www.amazon.com/Anh-Bui/e/B07TTJHQHC/ref=dp_byline_cont_pop_book_1  Become a supporter for early access to my new episodes, accompanying lesson notes and Q&A sessions: https://www.patreon.com/lvwa