Despite often being considered synonymous, the roles of Grand Secretary (Tể tướng) and Vice-Premier (Thừa tướng) held distinct positions within Vietnamese history. Historical records demonstrate clear differences between the two offices, suggesting they were not interchangeable. The text poses a question to readers, challenging their understanding of these key political figures. It implies a common misconception exists regarding the precise nature of their responsibilities and authority. Understanding these nuances is crucial for a comprehensive grasp of Vietnam’s historical administrative system. The article aims to clarify these distinctions, offering a deeper insight into the intricacies of Vietnam’s past governance. This clarification seeks to highlight the specific functions and powers associated with each position.