/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: vuphamvv https://public.slidesharecdn.com/v2/images/profile-picture.png Ưu Ä‘iểm: Lạc quan Nhược Ä‘iểm: Quá lạc quan