The Vietnamese word "hạ cánh" is a verb that means "to land" or "to touch down." It is commonly used in the context of aircraft when they come down from the sky to land on a runway.
Máy bay sẽ hạ cánh tại sân bay lúc 5 giờ chiều.
(The plane will land at the airport at 5 PM.)
Phi công thông báo rằng máy bay đã hạ cánh an toàn.
(The pilot announced that the plane has landed safely.)
In summary, "hạ cánh" is an important verb in Vietnamese related to landing, particularly in aviation.