Viet Nam/reported/ the /Thien Duong/ it is/ longest cave/ in /that/is36/36Viet Nam/reported/ the /Thien Duong/ it is/ longest cave/ in /that/isNhập câu trả lời ở đây0/3000 ký tựGiải thíchĐáp án: It is reported that Thien Duong is the longest cave in Viet Nam.