English language proficiency is crucial for academic and professional success, with effective communication skills playing a pivotal role. Collaborative teaching methods, particularly group work, can significantly enhance students' creativity, evaluation, synthesis, analysis, and comparison, as well as problem-solving, essential for developing collaborative abilities. Furthermore, non-English major students often struggle to develop their speaking skills due to limited practice opportunities. This study addresses this challenge by implementing group-work activities in an English as a Foreign Language (EFL) classroom. A mixed-methods approach was used to gather data including quantitative data collected through a questionnaire administered to 71 non-major students at Dong Nai Technology University and qualitative data came from semi-structured interviews. The results showed that group work significantly improved students' fluency, coherence, and confidence. Students reported increased motivation and engagement in speaking activities. These findings suggest that group-work activities effectively enhance speaking skills for non-English major students.