Juvenile or youth offending, sentencing etc may well be the focus of one or more general books. But to do "narrow" subject searches in SOLO try as many of the following as apply to your research interests:
Juvenile delinquency
Juvenile delinquency -- Prevention
Juvenile delinquents -- Services for
Social work with juvenile delinquents
Juvenile justice, Administration of
Juvenile offenders
Juvenile corrections
Juvenile recidivists
Juvenile delinquents -- Rehabilitation
Gang prevention
Peer pressure
Blackstone's Handbook of Youths in the Criminal Courts by 
Youth and Crime by 
The Handbook of Juvenile Delinquency and Juvenile Justice by 
Why Children Follow Rules : legal socialization and the development of legitimacy by Rook & Ward on Sexual Offences - holders of an Oxford SSO can access current edition via our Westlaw UK subscription.
Children's Views and Evidence by