Where does “nguyên vẹn” come from?

nguyên vẹn (Vietnamese) comes from Vietnamese vẹn, from French veine, from Middle French vene, from Old French veine, from Latin venia, from Proto-Indo-European wn̥h₁yeh₂, from Proto-Indo-European wenh₁- — to love.

nguyên vẹn (Vietnamese): intact; whole; undamaged

Definitions

intact; whole; undamaged

Ancestry of “nguyên vẹn”, step by step

nguyên vẹn traces back through two separate lines of ancestry.

via Vietnamese vẹn

Step	Language	Word	Meaning
1	Vietnamese	vẹn	to keep (one's promise); to be true to
2	French	veine	vein; vein, seam; luck
3	Middle French	vene	vein
4	Old French	veine	vein
5	Latin	venia	indulgence, kindness; mercy, grace, favour;...
6	Proto-Indo-European	wn̥h₁yeh₂	—
7	Proto-Indo-European	wenh₁-	to love

via Vietnamese Nguyên

Step	Language	Word	Meaning
1	Vietnamese	Nguyên	Yuan, a Mongolian dynasty
2	Chinese Mandarin	元	—
3	Chinese Mandarin	圓	—

Every word from Proto-Indo-European wenh₁- →Every word from Proto-Indo-European wn̥h₁yeh₂ →Every word from Latin venia →