Source Liberating from the Bondages of body speech and mind

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In the Tibetan language: Lus ngag yid gsum bchings pa las grol bar byed pa shes bya wai gzungsIn the Indian language: Kaya vaki chi prita stambhana vijaya dharani

This Sutra/Dharani is often being talked about by Lama Zopa etc. The pdf https://fpmt.app.box.com/s/x1pdydl3b92e ... oh1ikcyhnz says it is from the Sungdu of the Kangyur, however if I look then it is not there. I cannot find it. Is this text legit and where can I find it? Would really like to see the tibetan and also generally check its authenticity.

Best regards,
Toey

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Whoever may have similar questions:

Turns out the information given of fpmt is wrong and this Sutra is not found in the Kangyur. There are some versions of this sutra under a slightly different tibetan name on BUDA and it says at the end of one text that they have been transcribed (from the Sanskrit?) by Gayadhara and Drokmi Lotsawa. Not sure what to make of it.