Nuns on the Run (1990)

Brian and Charlie work for a gangster. When their boss learns that they want to "leave", he sets them up to be killed, after they help rob the local Triads of their drug-dealing profits. They decide to steal the money for themselves, but when their escape doesn't go to plan, they must seek refuge in a nuns' teacher-training school. Disguised as nuns, they must avoid their boss, Triads, the police, and Brian's girlfriend. There's also the problem of them being men disguised as nuns in an all-women institution.