How I can search in Arabic keyboard in Apple Tv

It's not possible to change the screen keyboard to Arabic. You could try using the Remote App on an iPad, iPhone, or iPod, but I don't know if it works.

i use remote app on my iphone to type in arabic

Remote App would help you to use Arabic keyboard to search on Apple TV.

I think it is time update Apple TV IOS to have on screen keyboard supports several languages.