toi dang lan dau tien bien soan mot cuon sach, thay cac cuon sach "mai mai tuoi 20" hay nhu cuon "Le van yeu va song" duoc PR tot qua, khong biet ho lam the nao nhi???? cac bac co biet cach nao PR cho sach hieu qua ma re tien khong??? (vi lam sach duoc it tien lam) PR kieu nay moi kho day, mong cac bac nhiet tinh giup nhe neu co goi y cac bac gui giup vao walletaaa@yahoo.com cam on nhieu!!!
