Sách giáo khoa Cánh Diều is a free educational and reference app developed by Physic Dream Heart for Android devices. It offers a wide range of textbooks and reference materials for students of grades 1, 2, and 6, which are part of the 2018 education curriculum.

The app's user interface is simple and easy to navigate, providing students with a clear and concise learning experience. The graphics are sharp and clear, making it easy for students to read and understand the content. Overall, Sách giáo khoa Cánh Diều is an excellent educational resource for students and teachers alike.