Oral presentation skills are becoming very important and essential in language teaching, especially for University students. Oral presentation skills are essential for employability and true academic study as they lead students to enter into debate and sustained reasoning (Morley, 2001).  However, most of my first year students struggled with doing oral presentations since they have had very little, or no practice in presenting in English when they were at high schools. This action research aimed at improving the students’ oral presentation skills by giving them principles on conducting a good presentation accompanied with good models. The subjects were ten undergraduate students in an English for communication course at Can Tho University, Viet Nam. Data were collected through two sets of observation forms and two sets of video recordings. The result showed that the students made great improvement in doing oral presentations after the training. It is recommended that teaching principles and giving models on doing oral presentations should be applied the curriculum right in the first semester of the academic years.