Bac Kan police arrested a madame who enlisted high school students as sex workers in the north central province.
On Tuesday, police caught a school girl, identified only as T, having sex with two men at the Tu Anh Hotel in Bac Kan Town, Bac Kan Online reported.
T confessed that Nguyen Thi Vui, 20, had procured her for the men.
At the police station, Vui confessed she had recruited the students into her ring of call girls after learning that they lead a reckless life and were in need of money.
Whenever she found a customer, Vui texted the students about the hotel and collected the money directly from the customer.
She then charged each customer VND500,000-700,000 (US$23.6-33) and paid the students VND200,000-300,000.
Police are investigating the allegations.
In another high-profile case involving school girl prostitution, a principal in Ha Giang Province was sentenced to nine years in prison in 2011 for having sex with his underage students.
Sam Duc Xuong, the former principal of Viet Lam High School, was said to have offered several students money or high marks in exchange for sex between July 2008 and August 2009.
Six of his victims were under 18.
The court also handed down suspended sentences of 36 months and 30 months respectively to two of his students, Nguyen Thuy Hang and Nguyen Thi Thanh Thuy, both 20, for procuring schoolgirls for Xuong.
The two girls said they themselves had sex with Xuong.