Hello,
All characters are fully tested (spanish, german, hebrew, arabic...) when using the embedHTML method. Please check that Tidy and mbstring PHP extensions are installed and enabled on your server and try again.
You can find a receipt in the cookbook about accents and other special characters:
http://www.phpdocx.com/documentation/cookbook/convert-html-to-word
If after install and enable Tidy, you still have issues, please send the most sample script that illustrate your issue (without external connections or database access) to contact[at]phpdocx.com and the dev team check it to find any mistake.
Regards.
P.S. : we have changed your username to hide the email you wrote as username