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�ݺ�ߣshows by User: nguyenkhanhduy10 / http://www.slideshare.net/images/logo.gif �ݺ�ߣshows by User: nguyenkhanhduy10 / �ݺ�ߣShare feed for �ݺ�ߣshows by User: nguyenkhanhduy10 https://cdn.slidesharecdn.com/profile-photo-nguyenkhanhduy10-48x48.jpg?cb=1679036408 "Có công mài sắt, có ngày nên kim!" kho tinh, nghiem khac...