khuôn (“shape”) + trăng (“the Moon”).
khuôn trăng • (囷𦝄)
- (literary) the pretty face of a woman
1820, Nguyễn Du (阮攸), Đoạn trường tân thanh (Truyện Kiều)[1], published 1866, lines 19–20:雲莊重恪潙
囷𦝄苔惮𧍋𦬑囊- Vân’s beauty was very remarkable.
Her eyebrows – full crescent arcs, her moonlit face – oval.