Chi Do gives a good answer.
But, I tend to look at the subject going back to Trưng Trắc and Trưng Nhị, two thousand years ago. The Trưng Sisters (Hai Bà Trưng). For at least two thousand years China has been trying to conquer what is now named Vietnam. This makes the Vietnamese very cautious about China. Note, anyone who does not know who the Hai Bà Trưng are doesn’t know enough about Vietnamese history to say anything useful.
But, China does provide much of Vietnamese Culture. Historically, the warfare between China and Vietnam is burned into the Vietnamese soul, Culturally Vietnam and China have many similarities.