Loan Nguyen1,2, Bay Vo3, and Tzung-Pei Hong4,5 1Division of Knowledge and System Engineering for IC T, Ton Duc Thang University, Vietnam 2Faculty of Information Technology, Ton Duc Thang Un iversity, Vietnam 3Faculty of Information Technology, Ho Chi Minh City University of Technology, Vietnam 4Department of CSIE, National University of Kaohsiung, Taiwan 5Department of CSE, National Sun Yat-sen University, Taiwan