Where does “Quan Thế Âm” come from?

Quan Thế Âm (Vietnamese) comes from Chinese 觀世音, from Sanskrit अवलोकितस्वर.

Ancestry of “Quan Thế Âm”, step by step

Step	Language	Word	Meaning
1	Chinese	觀世音	—
2	Sanskrit	अवलोकितस्वर	—

Quan Thế Âm — Etymology, Origin & Word History | Etymology Explorer