Okay it has taken me several days but I read your report which was a very well written opinion piece that in no way refuted anything that I said in my first post. In fact it pretty much backed up everything I said. China was defeated in several battles very badly and routed in some of them all while receiving massive casualties. I also read the Naval post graduate report which states pretty much the direct opposite of the report above. It suggests that China wanted to occupy northern Vietnam and when they saw that it would be to costly the smartly withdrew and moved their goal posts by stating that their objectives had been met. I bought this book on amazon kindle and read it as well and it totally disagrees with the assessment of the report that you posted. https://www.amazon.com/Deng-Xiaopings-Long-War-1979-1991/dp/146962124X/ref=as_li_ss_tl?s=books&ie=UTF8&qid=1515163488&sr=1-1&keywords=Deng+Xiaoping%E2%80%99s+Long+War+%E2%80%93+The+Military+Conflict+between+China+and+Vietnam+1979-1...
This book
https://www.amazon.com/Deng-Xiaopings-Long-War-1979-1991/dp/146962124X
Deng Xiaoping's long war by Zhang Xiaoming.
I purchased my hard copy several years ago. Its available on kindle if you wish to support the author. If you search hard enough, you can find a free PDF copy like here.