Tieng Anh Lop 9 - English 9 is a free Android educational app designed to provide students with a comprehensive listening experience based on the 9th-grade English textbook of the Ministry of Education and Training. The app offers audio, vocabulary, and dialogues for each lesson in Listen and Read, Listen, and Read sections.

The app can be used offline, making it easy for students to listen and learn each lesson at their convenience. The app provides visual aids alongside audio for each lesson, and by clicking on the image, students can listen to the pronunciation of each word. Vocabulary for each lesson is also included, helping students learn and revise the lesson better. The app is also useful for teachers who can use it on their mobile phones or tablets to teach their students in the classroom.

It's worth noting that the app is part of a group of free educational apps aimed at supporting students' self-learning and is not intended for commercial purposes. The app is only intended to support learning and cannot entirely replace the English textbook. If you have any suggestions or feedback, you can contact the developers at