Again, FB is changing their search algorithm, based on social graph, there will be a difference in the FB search results soon.
Reply Thank you so much Evotive for your useful sharing.
Reply Facebook has changed again, and there are more changes coming up.
At this time (July 2013) click on “Edit Page” at the top of the page, then the “Edit Settings” option in the drop down menu.
I have finally have found it in the First Reason, which i have limited my original country Cambodia only.