In the case that the teacher owes money, the creditor should collect and retain true evidence materials, such as debt notes, etc. In the case of repeated normal collection or failure, the creditor should file a lawsuit to the court within the limitation of action, which is three years.
 [Legal Basis]
 In Article 188 of the Civil Code, the limitation period of action for requesting the people's court to protect civil rights is three years. If the law provides otherwise, such provisions shall prevail.
 The limitation period of action shall be counted from the date when the obligee knows or should know that his rights have been damaged and the obligor. If the law provides otherwise, such provisions shall prevail. However, if it has been more than 20 years since the date of damage to rights, the people's court shall not protect them. Under special circumstances, the people's court may decide to extend them on the application of the obligee.