Han Viet Tu Dien is an Android application that provides a simple and convenient way to look up Vietnamese and Chinese characters. The application is developed by Mai The Hung and is available for free in the Education & Reference category.

The application offers several features, including the ability to search for characters in both Vietnamese and Chinese, view characters by radical and stroke count, Hán Việt phonetics, and learn Chinese characters through literary works. Additionally, the app supports the writing of Chinese characters in stroke order based on radicals.

Overall, Han Viet Tu Dien is a useful tool for those looking to learn and understand Vietnamese and Chinese characters. The app is compatible with Android 9.0 and is a great addition to any language learner's toolkit.