Apex domains cannot have CNAME records.
Question and response
Question
dig tcheturbo.com.br. NS
Answer
tcheturbo.com.br. 4 NS ns2.tcheturbo.com.br.
tcheturbo.com.br. 4 NS ns1.tcheturbo.com.br.
Authority
The response has no authority records.
Additional
ns1.tcheturbo.com.br. 4 A 187.108.16.47
ns2.tcheturbo.com.br. 4 A 187.108.16.48
ns1.tcheturbo.com.br. 4 AAAA 2804:1684:0:0:187:108:16:47
ns2.tcheturbo.com.br. 4 AAAA 2804:1684:0:0:187:108:16:48
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0