/ http://www.slideshare.net/images/logo.gif / ºÝºÝߣShare feed for ºÝºÝߣshows by User: ngocvutran9461 https://cdn.slidesharecdn.com/profile-photo-ngocvutran9461-48x48.jpg?cb=1730173179 Rắc rối, phức tạp, dở hÆ¡i. Tin cậy, Ä‘Æ¡n giản, trung thá»±c.