Yeah Vietnam has a GDP of $408.8 Billion, a fraud of this magnitude is probably tantamount to treason.
Still huge, but not ~7% of GDP huge.
It was closer to ~0.5% of GDP per year for 11 years.
This is probably typical in countries without really strong institutions. Vietnam isn't exactly a 3rd world country...
The amount of fraud going on in 3rd world countries (as a % of GDP) is mind boggling.