Học Tiếng Anh - IELTS Song Ngữ is an Android app developed by BSD Education Team. It is a free education and reference app that offers a wide range of features to help users learn the English language. The app consists of various IELTS book translations, and the quality of the translations is exceptional.

One of the most notable features of the app is the ability to mark vocabulary words and phrases for further study. Additionally, there are many collocations and idioms that are commonly used in the IELTS exam, which are also included in the app. The app also has a vocabulary quiz function to help users memorize words more efficiently and for a longer time. Furthermore, the app provides a dictation feature that helps users to practice their listening and speaking skills.

Overall, Học Tiếng Anh - IELTS Song Ngữ is an excellent app for anyone who wants to improve their English language skills, especially those who are preparing for the IELTS exam. The app is easy to navigate, and its features are comprehensive, making it a valuable tool for language learners.