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

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