Hello,
I think you have to play again with the language file and to add the Thai fonts in your Dolibarr installation.
I found that file http://www.dolibarr.org/images/fbfiles/files/tcpdf_thai_fonts.zip , you can try to unzip and copy inside ...\includes\tcpdf\fonts
Or you can download the latest tcpdf package on www.tcpdf.org then copy the content of the fonts folder in your Dolibarr installation(...\includes\tcpdf\fonts), perhaps there is one font basically suitable for Thai in the standard package
Then for instance if you use English language, so edit the file ...\langs\en-US\main.lang then at the beginning of the file you add FONTFORPDF=angsanaupci
If the font "angsanaupci" is not working so try another one...
Make a backup copy before modifications...
Please let us know whether or not you achieve to get it working !
Rgds.
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