Name of thesis: Prevention of illegally using synthetic drugs by youth according to the function of police force for investigation of drug-related crimes
Major: Criminology and Criminal Prevention 
Code: 62.38.01.05
Name of PhD student: Ha Thu Hang
Scientific title, degree and full name of the supervisors:
1. Assoc. Prof. Dr. Hoang Thi Bich Ngoc
2. Assoc. Prof. Dr. Ngo Gia Bac
Name of training institute: The People's Police Academy - Ministry of Public Security.

New contributions of the thesis:
The thesis is an in-depth study about the prevention of illegally using synthetic drugs by youth according to the function of police force for investigation of drug-related crimes.
The thesis has complemented and completed the theoretical system on prevention ofillegally using synthetic drugsby youth, which practically served for the prevention of illegally using synthetic drugs by youth.
By surveying the status of the prevention of illegally using synthetic drugs by youth according to the function of police force for investigation of drug-related crimes, the thesis has pointed out the results, strong points, shortcomings and the causes to those shortcomings in this operation of the police force for investigation of drug-related crimes.
The thesis has brought forward the solutions in order to improve the prevention of illegally using synthetic drugs by youth according to the function of police force for investigation of drug-related crimes.