/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: ChaCTnHay https://cdn.slidesharecdn.com/profile-photo-ChaCTnHay-48x48.jpg?cb=1523132317 Chẳng có gì ngoài trí óc và sá»± cần cù