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I'm not sure there is even any address there at all.
The four authoritative nameservers seem to be offline [at least from my small window to the Internet].
Yeah, "freenom", ".tk", "LE" ...
Someone is really trying to learn on the cheap!
Compliments to the struggle and may you overcome it quickly.
@satwellmann, but you must understand that...
The first step in obtaining a certificate to secure a website (via HTTP authentication) is having an HTTP web site that can be reached from the Internet.
http://minhnet7845.tk/ returns nothing... It fails to connect.... It fails to even resolve to a valid IP.