Can you recommend me any good online school where i can get diploma of Special Education? I am from brunei (South East Asia) with highest education of GCSE plus just completed certificate of childcare. I am working as a TA with children with austism, dyslexia, ADHD so doing a special education course will help me to teach them better. I checked the website but some school only available to students from their own country. Thank you in advance to you all who spend time to reply my question.

I would not recommend those, not sure about the legitimacy of accreditation’s.
To get a degree which would be accepted according to American teacher education standards, you’d have to take more than one special education course.
Plus, the accredited and legitimate versions require completion of standardized testing programs. This is also part of teacher licensing.
To actually have your degree mean something (and be permitted in a classroom) you will need an accredited program–otherwise a school district will not hire you.