Then to complete the previously described problem, my PHP file was ANSI encoded.
But I did more try by saving the source file with UTF-8 encoding (without BOM), then:
1. If I let the call to setEncodeUTF8 function, then both text (added by AddText and HTML embedded) are not well rendered.
2. If I comment the call to setEncodeUTF8 function, only the text added by AddText is well rendered, the html text added in the table shows bad characters.
Basically, by modifying the source encoding charset to UTF-8 (without BOM), the document is well produced (I mean no error occur when I open it with word) BUT I don't yet have the expected result ( to text with accent well rendered by adding with AddText and by embedding HTML in the same time)