"Does the invisibility cloak exist?"
Translation:Chiếc áo khoác tàng hình có tồn tại không?
Why is chiếc here? It's not required, but going on the supposition that 'multi-word nouns don't need classifiers' -- witness 'cây táo' earlier-- why it's even suggested is puzzling.
Moreover, chiếc seems to be associated with machines--airplanes, cars, motorbikes, submarines, etc--so with a coat it seems out of place.