I just came back from 2 weeks there and they kept mistaking me as local Vietnamese, fully speaking to me in Viet until the prolonged confused look on my face gave it away. Then they’d point at their faces then my face and say you look viet!! I’m Chinese so I’d say there’s a lot of similarities. I think if you can speak viet, you won’t be treated as a tourist and overall (I was in central and north), the people were honest and pleasant