Cannot post request and get expected result in python3?

I found this link 'https://finduid.atpsoftware.vn/' which search facebook id by phone number. I want write a python script take a phone number, post to that link and return facebook link.

I was found data it need is {'phone': 'phone no.', 'getid': 'Tìm kiếm facebook'}. But when i post it using requests.post(url, data), i got nothing (it return homepage and result field is blank). I was tried with selenium and get same result

Do i missing something? I'm new in python. Thank you!