thanks for sharing it
http://tieudunghay.com/threads/kinh-nghiem-phan-biet-laptop-xin.33167/
http://www.1nhap.vn/threads/3073-Chon-cach-chao-hang-truc-tuyen-hieu-qua-nhat
http://suckhoe123.com/threads/s%E1%BB%B1-nguy-hi%E1%BB%83m-ti%E1%BB%81m-%E1%BA%A8n-c%E1%BB%A7a-b%E1%BB%87nh-cao-huy%E1%BA%BFt-%C3%81p.1540/