Although not only on Vietnam, I really recommend you have a look at the Veterans SA fantastic Think Piece series at http://anzaccentenary.sa.gov.au/stories/think-piece-series/
The ‘Think Pieces’ are short discussion articles written by eminent South Australians, veterans, defence personnel, military historians, authors, academics, educators, journalists and other specialists who have a particular interest and/or expertise in the Anzac Centenary and in Australia’s military history. The objective of the series is to offer different perspectives on the Anzac Centenary, its significance and meaning. Have a look at the archive of the excellent articles posted this year. Interestingly the stories in the archives have been classified in accordance with some of the Spirit of Anzac characteristics that we have talked about during this competition.