In this paper, we will consider the k-th derivative instead of the first derivative of the meromorphic functions. Thus, our work generalizes the related results due to Kamal Boussaf, Alain Escassut and Jacqueline Ojeda | ISSN: 1859-2171 TNU Journal of Science and Technology ; Email: jst@ 192(16): 59 - 65 59 Tran Thanh Tung et al. 60 TNU Journal of Science and Technology 192(16): 59 - 65 ; Email: jst@ Tran Thanh Tung et al. TNU Journal of Science and Technology ; Email: jst@ 192(16): 59 - 65 61 Tran Thanh Tung et al. 62 TNU Journal of Science and Technology 192(16): 59 - 65 ; Email: jst@ Tran Thanh Tung et al. TNU Journal of Science and Technology ; Email: jst@ 192(16): 59 - .
