Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Vietnam to Tuscany as you normally would.
Related info for your journey
Useful info, stats and facts about Vietnam to Tuscany flights.
This is defined as Ho Chi Minh City Airport (SGN) and Florence Peretola Airport (FLR). Codes like Florence Peretola Airport are often used to just call airports uniquely. Pisa Gal Galilei Airport (PSA), Campo nell'Elba Marina Di Campo Airport (EBA) are other airports near this flight route and their unique identifiers/IATA codes.