Can anyone tell me more about this collection of sutras by Tsongkhapa called the "Sung-due". I found some information that might be relevant here:http://www.lamayeshe.com/?sect=article&id=310
I got advice from Lama Dawa regarding this collection.
The gzung 'dus is a mainly a compendium of dharanis [gzungs]. But I don't think it was assembled by Tsongkhapa. I could be wrong, but I think it is older than him. Anyway, it contains many extracts of the dharani portions of sutras, small sutras, for healing, repelling obstacles, it has aspiration prayers, etc.