Apex domains cannot have CNAME records.
Question and response
Question
dig openfind.com.tw. NS
Answer
openfind.com.tw. 4 NS dns.openfind.com.tw.
openfind.com.tw. 4 NS ns2.mail2000.com.tw.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0