The domains are both protected with privacy controls. You could send an email to the address listed in the WhoIs, as sometimes people have these accounts forwarding to their main email accounts. Otherwise you may wish to enlist specialist help - Sedo brokers might be able to point you in the right direction, although I can't recommend them as I have no pervious experience with them.
No trick at all,they used domain name privacy protection.So you can't see the details of their information.Nowadays,many domain registrars support such service.Some are free,while some are not.