Do you need to collect and re-check your luggage during a layover/connecting flight at Hanoi Noi Bai Airport?

To find out if you need to collect your luggage in Hanoi, check the baggage tag issued at check-in. If it shows your final destination (e.g. your home city), the bag is checked through automatically. If it's tagged only to Hanoi, you'll need to pick it up and re-check it for your connecting flight. You can also confirm this at the check-in counter at your departure airport.

During baggage security checks at Vietnamese airports (for example Cam Ranh), if your suitcase is wrapped in plastic film, staff may ask you to open it for inspection — meaning you'll have to unwrap it yourself.

In practice, transit through Hanoi works like this: you collect your bag at the arrivals belt, staff with transit stickers approach you (or you find them yourself), they tag your suitcase and show you where to drop it off — it's then transported for you. Next, you take a free shuttle bus (staff point you to it) to the next terminal, where you simply check in for your flight.