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Anh vặn cánh cửa để mở cửa.
He turned the door handle to open the door.
The handle or knob attached to a door that is used to open or close it.
Cánh cửa này bị hỏng, tôi không thể mở cửa được.
This door handle is broken, I can't open the door.
This is the most common meaning of 'cánh cửa' in everyday Vietnamese.
Do not confuse 'cánh cửa' with 'cửa' (door). 'Cánh cửa' specifically refers to the handle.
Composed of 'cánh' (handle/lever) and 'cửa' (door), reflecting the physical component of a door.
In Vietnamese, 'cánh cửa' specifically refers to the handle or knob, not the entire door. For the door itself, use 'cửa'.