vườn thượng uyển

Etymology
🇰🇲. Attested in Vịnh hoa yên tự phú (詠花煙寺賦), attributed to (1254-1334).

A so-called "redundant" construction, because both and  are morphemes that mean "garden";  itself is also attested as a free noun in texts.

Noun

 * 1)  royal garden