contact.thanhdateiegroup.com has no NS records.
NS records for this zone are defined at thanhdateiegroup.com.
NS records for this zone are defined at thanhdateiegroup.com.
Question and response
Question
dig contact.thanhdateiegroup.com. NS
Answer
The response has no answer records.
Authority
thanhdateiegroup.com. 900 SOA ns-620.awsdns-13.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0