1 > Vườn quốc gia Phong Nha-Kẻ Bàng, Vịnh Hạ Long , Cố đô Huế
2> I think .... is not because tourism is one of the economic development sectors in Vietnam. So we have to develop, introduce, and exhibit the rich nature of Vietnam.
3> Perhaps it is not because the nature of Vietnamese culture is mainly influenced by nature and people only have a small impact in the exchange and exhibition.
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P/s : ko hiểu cứ hỏi