dhcp server option domain search

I wonder if there is a way configure two diffrent domains in dhcp server, like domain aaa, and searchdomain like bbb.

From dhcp server I get only one domain from:

/dhcp server network set domain

$ cat /etc/resolv.conf 

# Generated by NetworkManager
domain xxx
search xxx

I try to add dhcp server option like

/ip dhcp-server option add name=domain_aaa code=15 value=aaa
/ip dhcp-server option add name=domain_bbb code=119 value=bbb

/ip dhcp-server network set X dhcp-option=domain_aaa,domain_bbb

but no effect

run in linux machine.

dhclient

I tested in fedora 15 and its work.