The first question is who was De Men phiêu lưu ký written by?
I think the answer is To Hoai.
The second question is when was Lao Hac written?
I think it was written in 1943.
The third question is: Was the poem Ong do written by Ho Chi Minh?
No, It wasn’t. It was written by Vu Dinh Lien.