Welcome to the OvniConv project.
This project is about developing some OpenDocumentFormat tools to help converting to TCVN 6909:2001 (Unicode) all files encoded with old Vietnamese encoding, say TCVN 5712:1993, VNI, VPS, and so on.
ooffice test-tcvn.doc
unzip test.odt content.xml
iconv --from=UTF-8 --to=WINDOWS-1252 < content.xml > content-tcvn.xml
iconv --from=TCVN-5712 --to=UTF-8 < content-tcvn.xml > content.xml
zip test.odt content.xml
ooffice test.odt
About the HyphenationIssue