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Biligual Review Word File doesn't show special characters correctly.

I've generated a bilingual review Word file for US-English to Thai translation. Special characters in the English source (e.g. Greek letters, superscripts, subscripts) weren't correctly shown. Instead, there were some kind of incomprehensible codings in place of those characters. The file is confidential, thus I can't provide any illustration of the issue. How can I generate a bilingual review Word file with accurate spellings according to the source?