Ai noi Google khong quang cao? Co khac chi la Google quang cao rat don gian, chi co cai url thoi con Yahoo dung banner. Moi cong ty co loai khach hang khac, khi search thi nguoi ta muon page load cho le nen Google phai dung quang cao don gian, con khi nguoi ta vao mot trang nhu Yahoo thi co banner o tren khong co sao. Cu dem thu coi coi bao nhieu cai banner o tren trang Yahoo va nguoc lai moi lan search cai gi, co bao nhieu cai quang cao o tren Google, cho du chi la cai url thoi.