Sách Giáo Khoa lớp 3 đến lớp 5 is a free educational app developed by Physic Dream Heart for Android devices. This app provides a comprehensive collection of textbooks for primary school students in Vietnam. The app covers textbooks for grades 3 to 5, but unfortunately, there are no textbooks available for grades 1, 2, and 6.

The app is easy to navigate, and users can access the textbooks by selecting the grade and subject they need. The app also provides a search function that allows users to quickly find specific topics. Each textbook contains detailed explanations, examples, and exercises to help students understand the material. Overall, Sách Giáo Khoa lớp 3 đến lớp 5 is a useful app for primary school students in Vietnam, providing them with easy access to textbooks and educational resources.