Hello, I am Cambodian citizen. I have some questions to ask you.

Chan, you can apply for a spouse Q1 type to enter China, and then you can get a temporary residence permit which will allow you to live with your husband. The required documents for Q1 type include your passport and its copy, the application form, a passport-sized color photo, an invitation letter from your husband and copy of his Chinese ID card, and your marriage certificate. Next, submit the application to the embassy of China to apply for it.
Your parents can apply for an S2 type to China for 3 or 4 months. Those documents are needed: passport and copy of its data page, an application form, a bareheaded color photo, an invitation letter from you, and copy of your passport and residence permit, as well as relationship certificate.