During November 2025, Tuan expanded the EbookFoundation/free-programming-books repository by adding two Vietnamese-language Go programming courses, enhancing access to Go educational resources for Vietnamese speakers. He managed content curation and localization using Markdown, collaborating with the external contributor Code With Tuan to ensure the new materials met repository standards. The work focused on educational resource development and content management, with careful attention to commit traceability and repository quality. Although no bugs were fixed during this period, Tuan’s contribution broadened the repository’s multilingual coverage and supported open-source collaboration, providing a foundation for further localization and resource expansion in the future.