Perhaps you should try some spelling variations:
"global geographical range paper i/2011" » "global geographical area paper i/2011", "global geographical labor paper i/2011", "global geographical coverage paper i/2011", "global geographical range paper _/2011", "global geographical range papers _/2011"
"_ demographic change paper ii/2011" » "_ democratic change paper ii/2011", "_ demographic change parent ii/2011", "_ demographic change part ii/2011", "_ demographic change based ii/2011", "_ demographic change paper _/2011", "_ demographic change paper _i/2011", "_ demographic change papers _i/2011"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("global geographical range paper i/2011") OR ("_ demographic change paper ii/2011"))~.
• Removing quotes may allow a broader search: (( global geographical range paper i/2011 ) or ( _ demographic change paper ii/2011 ))~.
• Adding a wildcard symbol may retrieve word variants: (("global geographical range paper i/2011") or ("_ demographic change paper ii/2011"))*.