Hanoi, Sept. 11 -- Prime Minister Pham Minh Chinh has sent a letter of commendation to competent forces involved in the successful crackdown on large-scale drug trafficking rings transporting illicit substances from abroad into Vietnam. In his letter to the Vietnam Border Guard Command, the Border Guard Commands of Quang Tri and Ha Tinh provinces, and Da Nang city; and the central region task force for drug and crime prevention and control under the Border Guard Command's Department of Drug and Crime Prevention and Control, Prime Minister Pham Minh Chinh wrote: "I am pleased to learn that in August, the Vietnam Border Guard Command directed the Border Guard Commands of Quang Tri, Ha Tinh, Da Nang, and the central region task force for dru...