[Koha] Install wordpress website on a Koha's server

I had a Ubuntu server 12.04 with Koha installed and now i have 2 instances are running: http://test.dreamlib.org and http://tamgiang.dreamlib.org . My question is, can i install another wordpress website in this server (in /var/www) for main domain dreamlib.org? Do i need to config /etc/hosts? Thanks! Best regards! QuocUy