Five men and five women were given the death penalty after the trial this week in Hanoi, while two others got life in prison.
"The two ringleaders were paid hundreds thousands of dollars," for trafficking the drugs, state-run Vietnamnet news site reported.
Court officials could not be reached for comment on Friday.
The trial comes on the heels of several massive drugs busts in Vietnam, which boasts some of the world's toughest drug laws.
Anyone caught with more than 600 grams (21 ounces) of heroin or more than 2.5 kilograms of methamphetamine can face the death penalty.
That bust came just weeks after a similar haul of one tonne of crystal meth -- or "ice" -- and around one tonne of ketamine in the city.
Young Vietnamese are increasingly turning to synthetics like ketamine, ecstasy and meth.
The suspected overdose deaths of seven youngsters at a music festival in Hanoi last year stunned the conservative communist capital.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)