/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: anhkietpham940 https://public.slidesharecdn.com/v2/images/profile-picture.png tá»± kỉ, ế, nhÆ°ng Ä‘á»™c thân vui tính.hihi