/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: nguyentrunghieu790 https://public.slidesharecdn.com/v2/images/profile-picture.png Không cần giá»›i thiệu, tiếp xúc rồi sẽ biết :P