What is the best way to improve learners' intonation, accent and pronunciation, and to strengthen learning skills? How can we make their speech more natural and flowing? Focussing on Vietnamese learners of Japanese, we investigated the following three aspects of difficulties with Japanese pronunciation: 1) rhythm 2) single-syllable pronunciation, and 3) the delivery and intonation of utterances. This study reports on a three-month clinic which addressed these issues. Based on teacher observation and a student questionnaire, the study examines student awareness of pronunciation, continued practice, improvement in ability and overall effectiveness of practice.