/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: nguyenbinhnguyen7 https://cdn.slidesharecdn.com/profile-photo-nguyenbinhnguyen7-48x48.jpg?cb=1523671268 từ Ä‘on giản đến phức tạp