Perhaps you should try some spelling variations:
"northern mariana" » "northern ghana", "northern mali", "northern asia"
"northern canada" » "northern central"
"northern africa" » "southern africa", "southern african", "north africa"

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: (((("northern mariana") OR ("northern canada"))) OR ("northern africa")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"northern mariana\") OR (\"northern canada\"))) or (\"northern africa\"))".
• Removing quotes may allow a broader search: (((( northern mariana ) OR ( northern canada ))) or ( northern africa )).
• Adding a wildcard symbol may retrieve word variants: (((("northern mariana") OR ("northern canada"))) or ("northern africa"))*.