The new and modern learning approach - Cooperative Learning - has been applied worldwide recently. It is a student-centered approach that enhances students' communicative and interpersonal skills in group work activities. At School of Foreign Languages and Tourism of Hanoi University of Industry (SLT – HaUI), the growth of language clubs, especially English Clubs (EC) is flourished with various practical extra curriculum activities aiding hundreds of students' speaking ability. However, to boost students' motivation in learning and speaking competency, some new and effective models should be applied. This study aims at (1) applying Spencer Kagan's teambuilding model to EC activities for students at university level, and then (2) evaluating the effectiveness of that model in improving speaking competency and cooperation among the club's members. The designed teambuilding activities are directly applied at the "English for You Club" (E4U) – at School of Languages and Tourism (Hanoi University of Industry) using qualitative and quantitative methods. Collected data from the used instruments such as survey questionnaire, structured interviews with randomly selected members from the list, and observations during 8 weeks indicated that the designed teambuilding activities were based on 5 aims: (1) Getting acquaintance, (2) Team identity, (3) Mutual support, (4) Valuing differences, (5) Developing synergy have positive impacts on improving members speaking competency and encouraging interactions and cooperation among all club's members. Additionally, the study contributes significantly with the guidance of the activity files and the detailed instructions for the EC in designing and developing the practical handouts for members.