I. Marketing tr?c ti?p l? g??. Hi?p h?i Marketing tr?c ti?p Hoa K? (US DMA) d?nh nghia : ?Marketing tr?c ti?p l? h? th?ng tuong t?c c?a Marketing c? s? d?ng m?t hay nhi?u phuong ti?n qu?ng c?o d? t?c d?ng d?n m?t ph?n ?ng d?p l?i do lu?ng du?c ? b?t c? m?i noi\". . Nghe nh?ng d?nh nghia h?n l?m th?
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