I would like to fine tuning tesseract traineddata with Thai language (tha). 
But unfortunately, after extract original tha.traineddata from official 
tesseract tessdata-best. I've found that there is some character missing in 
tha.unicharset, e.g. Thai number ๐ ๑ ๒ ๓ ๕ (0 1 2 3 5) is appear in 
tha.unicharset but ๔ ๖ ๗ ๘ ๙ (4 6 7 8 9) is missing.

I have fine-tune original tha.traineddata to be included missing character. 
If I try to train it with new tha.training_text that include missing 
character with original tha.traineddata. 'Can't encode transcription:' will 
be appear on the whole training process if which line contained missing 
character.

example:
Can't encode transcription: 
'๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗๗'
 
in language '' Encoding of string failed! Failure bytes: e0 b9 98 e0 b9 98 
e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 
b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 
98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 
e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 
b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 
98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 
e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 
b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 
98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 
e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 
b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 
98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 
e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 
b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 
98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 
e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 b9 98 e0 
b9 98 e0 b9 98

My question is,  Is there any solution to fine tune tha.traineddata to be 
included some text that is not included in the unicharset file extracted 
from tha.traineddata? Could someone advise me that there is any solution 
for this?

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