English has become highly popular in Vietnam, emerging as the preferred language for diverse purposes. The increasing attendance at English Training Centers and schools shows a surge in adult learners seeking language refinement. Motivated by career progression, job prerequisites, learning objectives, and communication needs, these learners encounter many difficulties. This article explores the obstacles Vietnamese English as a Foreign Language (EFL) learners face, providing practical solutions for both learners and educators. A comprehensive study involving 70 adult learners studying EFL at the University of Danang - University of Foreign Language Studies (UD-UFLS) utilized questionnaires and interviews, employing qualitative and quantitative analyses. The research revealed that despite high motivation driven by job and career goals, learners struggle due to time constraints, limited English literacy skills, and financial burdens, diminishing the effectiveness of their learning. In response to these difficulties, constructive recommendations are offered to enhance the learning experience and address the prevalent issues.