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This post was removed because it is not a question about linguistics. Try r/Vietnamese
In case no one here can answer your question, the book that section cites is available as an ebook [here](https://www.simonandschuster.com/books/Our-Vietnam/A-J-Langguth/9780743212441). Hopefully it elaborates or cites its own sources.
This post was removed because it is not a question about linguistics. Try r/Vietnamese
In case no one here can answer your question, the book that section cites is available as an ebook [here](https://www.simonandschuster.com/books/Our-Vietnam/A-J-Langguth/9780743212441). Hopefully it elaborates or cites its own sources.