It is very difficult to find information or studies about cerebral palsy in Asia. In fact, the most concrete data found, regarding the prevalence of cerebral palsy in Asian communities came not from the continent of Asia itself, but from birth records collected on native Asians that had moved to California.
The Californian study showed that the rate of cp in Asians was lower, overall, than that of whites. However, that range varied greatly. In Thai children, the rate was 0.61 out of a thousand, while Samoans showed a similar rate to Caucasians at 2.08 in 1000. The study adjusted for things such as maternal age, birth weight, and other factors, but even after adjustments, the rate still remained lower.
You can find the study here.