During the period when China force its control over VN, there were mandatory gifts that the Vietnamese people had to ofter the Chinese yearly or even more often. These gifts range from inventions, arts, to even people with skill. I know these events occured and they are indeed recorded in history text, though I have heard some particular objects/people but I haven't bumped into textual verification. The big reason is that anything note would be under the name "China" because technically on the international view - VN was China. Our inventions would have been a subgroup of our oppressors. Here are some things my parents and my parents friends said are orignally Vietnamese - could anyone find more on this topic or share what you know?
1) The compass was originally Viet. Some people say this because sea trading wes more bustling in VN. The possible reason that it may be called a Chinese invention is because the sea right next to us is named "South China Sea"
2) Fine China - I heard of some realtion to "bát tràng" that the Viet cultured fine porcelain first
3) Dynamite - I heard that rudimentary and prototype dynamite was a Viet invention that was given to the Chinese?
Those of you from Chinese origin are probably gonna just say this is B.S. So don't bother posting if your gonna say that. 1000 years from now your gonna say Tibetan chanting is a "Chinese" invention because you currently own Tibet. This is like the US saying hoola dancers in Hawaii or the Tacos in New Mexico are 100% America. Canad says maple sirup is Canadian - bah!
