More context would be helpful. Where is your input string coming from, and what do you mean by "real value"?
Text::Unidecode only aims to provide a rough ASCII transliteration of the underlying characters, and it is self-admittedly quite bad at Thai. Is this really what you want?
Update: also, if you don't know about it already, be sure to check out Encode, the core Perl module that deals with character encodings.
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