/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: hongtru9 https://cdn.slidesharecdn.com/profile-photo-hongtru9-48x48.jpg?cb=1526463703 Sá»± phức tạp trong Ä‘Æ¡n giản, sá»± trầm lắng trong ồn ào.^^