ns.camnet.com.kh has no CNAME records.
Question and response
Question
dig ns.camnet.com.kh. NS
Answer
The response has no answer records.
Authority
camnet.com.kh. 10800 SOA ns.camnet.com.kh. hongsereyvuth\@camnet.com.kh. 2026021936 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0