Nguyen Tien Giang - Master of Engineering, Researcher, Information Technology Department. E-mail: ntgiang77@gmail.com Bui The Truyen - Dr.Sc., Teacher, Le Quy Don Technical University. E-mail: buithetruyen@gmail.com Luu Hong Dung - Dr.Sc., Teacher, Le Quy Don Technical University. E-mail: luuhongdung@gmail.com