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[English - Thai translation only]
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Source:
https://stackoverflow.com/questions/8492763/thai-line-breaking-how-to-break-thai-text-effectively
 
Some of the problems are usually due to the font or word breaks.
 
The font problem can be resolved using a different font or different version of the DTP software, the word breaks can be proofread by a Thai speaker, or the Thai text can be converted to use ZWSP (zero-width space) characters.
 
For proper alignment ZWSP
Source: (http://en.wikipedia.org/wiki/Zero-width_space) is the best method.
 
Enter is used for the new line. The space bar is used for the end of the sentence in Thai.