LONG BEACH, Calif. (KABC) -- A former San Pedro High School substitute teacher was sentenced Friday to more than three years in state prison on multiple counts of unlawful sex and child molestation with three minors.Michelle Yeh, 29, pleaded no contest to multiple charges and was sentenced to three years, eight months in state prison by a Los Angeles County Superior Court judge. She was ordered to register as sex offender for life.Yeh became a permanent substitute teacher at the high school in February 2015, where she pursued relationships with male students that included buying them gifts, taking one of them to Disneyland and meeting another at a hotel.During her court hearing, she pleaded no contest to having unlawful sex with a minor under the age of 16 and one felony count of oral copulation of a minor under 16. Both charges involved the same victim, who was 15 at the time.She then pleaded no contest to one count of lewd acts on a child involving a second victim, who was also 15 at the time.She entered in one more no contest plea to misdemeanor child molestation of a third victim, who was 16 at the time, and violating a court order not to have contact with any of the victims by texting the 16-year-old.