When you try to read Vietnamese with online reading tools like mouse-over dictionaries, it can be difficult because the text is often parsed incorrectly. LT has just added the ability to join and split words in Vietnamese. We can also do this with Japanese, Mandarin, Cantonese, Thai and Korean. This short video demonstrates how to use it with Japanese:
https://www.youtube.com/watch?v=R9Iyn3dEX_A&t=31s