like: ao khúc tuyến
Intermediate Level Advanced Level
Composite Words Listening Comprehension Oxford Topics Duolingo Topics 315 Activities
BEGINNER LEVEL
exact:
VNEN 
ao khúc tuyến * ☊ 
reentrant * ☊
[ ao ] : (1) pond; concave; (3) to measure (volume)
[ khúc ] : section, piece
[ tuyến ] : (1) line, lane; (2) gland