Bui Duc Tho, Nguyen Hoang Diep, Do Thi Thu Trang, Nguyen Thi Hai Nang, Ngo Thanh Huyen, Minh-Tien Nguyen and Van-Hau Nguyen 2020. AN INVESTIGATION OF VIETNAMESE DOCUMENT CLASSIFICATION. UTEHY Journal of Applied Science and Technology. 27, (Oct. 2020), 105-110.