This author has not been identified. Look up 'Vu Khanh Quy' in GoogleThis author has not been identified. Look up 'Pham Minh Chuan' in GoogleThis author has not been identified. Look up 'Vi Hoai Nam' in GoogleThis author has not been identified. Look up 'Linh Dao Manh' in GoogleThis author has not been identified. Look up 'Nguyen Tien Ban' in GoogleThis author has not been identified. Look up 'Nguyen Dinh Han' in Google