/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: haichamich299 https://cdn.slidesharecdn.com/profile-photo-haichamich299-48x48.jpg?cb=1523535019 Dá»… nhận thấy nhÆ°ng khó nắm bắt