5 aircraft and 8 cabin layouts, from the A321 to the 787-10. Pick one for its seat map, the best seats and the seats to avoid.
There are seat maps for 5 Vietnam Airlines aircraft here: the Airbus A321, the Airbus A321neo, the Airbus A350-900, the Boeing 787-9 and the Boeing 787-10.
The Boeing 787-10, with 361 seats: 24 Business and 337 Economy in its main layout.
The Airbus A350-900 and the Boeing 787-9 have Premium Economy in at least one layout.
The Airbus A350-900, with 32" of seat pitch in Economy and seats 18" wide.