Apex domains cannot have CNAME records.
Question and response
Question
dig thanhdateiegroup.com. NS
Answer
thanhdateiegroup.com. 5 NS ns-315.awsdns-39.com.
thanhdateiegroup.com. 5 NS ns-613.awsdns-12.net.
thanhdateiegroup.com. 5 NS ns-814.awsdns-37.net.
thanhdateiegroup.com. 5 NS ns-1608.awsdns-09.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0