Understanding the role of English language acquisition in developing the socioeconomic status of Vietnam forms the backdrop for this study, which seeks to shed light on the potential benefits of technology-assisted vocabulary learning. Based on this context, this study employed a mixed method of quantitative and qualitative design attempting to investigate the vocabulary development of college students (n=23) who were treated by the use of Memrise (Experimental group) in combination with a traditional teaching method compared to their counterparts (n=24) who were taught by a traditional teaching method (TTM) (Control group) without the use of this application. Students' thoughts about the benefits and challenges of Memrise for their vocabulary learning after the treatment were also investigated. The study yielded noteworthy results on multiple fronts. Quantitatively, data collected from the vocabulary post-tests showed that the experimental group significantly outperformed the control group in their vocabulary scores. Qualitatively, interview data indicated that Memrise positively impacted students' motivation and interest for vocabulary learning, suggesting its effectiveness in addressing the particular problems of engagement and retention in vocabulary acquisition. However, there were logistical challenges, particularly in rural settings. Factors like unstable internet connections and inadequate mobile devices adversely affected the quality of learning experiences with Memrise. By focusing on these elements, this study highlights key pedagogical implications and underscores the value of technological interventions in language learning, offering insights into addressing infrastructure barriers and tailoring e-learning methods to diverse learning environments and needs.