more than 6 domains in resolv.conf

[kurdya]

Hi,
I have to setup a DNS slave server for many zones (more than 10).
I'm trying to do it on CentOS 7.
I have such slaves on CentOS 6 and its works fine.
But in CentOS 7 i cannot add more than 6 domains in "search" field in resolv.conf.
I'm doing it via nmtui, and i see all my domains in nmtui, but in resolv.conf only 6 appears, as an impact DNS is only replying for requests to these 6 zones.
Where and how can i fix it?