well I read some sects of shiism use a different
version of Quran, in the sense they add another surah, I don't know the
name... so is really a shia version of Quran or interpretantion?
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Im really dont confirmed about what you said, There is only one Holy Quran of Allah Subhan A Tallah.

I can refer you a page from where you can get translation of Holy Quran in any language as well:
http://quranexplorer.com/quran/