Yes, there are multiple flights from Vietnam to Venice for under 20,713,464₫. The cheapest flight booked recently is on Turkish Airlines for just 19,355,582₫, but on average you can expect to pay 42,140,392₫.
There are no direct flights from Vietnam to Venice, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.
For as low as 23,797,468₫, Turkish Airlines can have you in Venice from Vietnam in 15h 40m. Both multi-stop and direct flights can be found to your destination and back.
Cheapflights users have booked flights from Vietnam to Venice round-trip from 19,355,582₫. Other airlines that can offer you cheap pricing are British Airways, from 24,856,156₫, and Alitalia, from 27,594,936₫.