Below are links to document that can provide you with more information about intellectual disabilities.
Supportive Document for Education for Children with Intellectual disability _English
Supportive Document for Education for Children with Intellectual disability _Khmer
Supportive Document for Education for Children with Intellectual disability _Trainer
crs_guideline for screening children with disabilities in Pre-school_Eng
crs_guideline for screening children with disabilities in Pre-school_ kh
The identification children under 6 years old manual in 2019_kh