English learners in Vietnam may have many difficulties when pronouncing English, mainly Nasals and Affricates since English has been their second most used language. There are many factors which lead to this problem like their mother tongue, their study environment, and a lack of knowledge about English phonology and phonetics. This assignment analyzes the problems in English’s Affricates and Nasals pronunciations experienced by Vietnamese EFL students. Data were collected and analyzed from many Vietnamese students including tips and techniques to improve each different pronunciation of Affricates and Nasals. This research will hopefully widen knowledge for those who want to improve their pronunciation of Affricates and Nasals and establish more information which could be able to be... developed in the English phonology and phonetics systems in Vietnam.