Perhaps you should try some spelling variations:
"_ duncan smith" » "_ duncan scott"
"ian duncan sarah" » "ian duncan adam", "ian duncan gray", "ian duncan shaw", "brian duncan sarah", "a duncan sarah", "jon duncan sarah"
"ian duncan sir" » "brian duncan sir", "a duncan sir", "jon duncan sir", "ian duncan i"

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: (("_ duncan smith") OR ((("ian duncan sir") OR ("ian duncan sarah")))).
• Removing quotes may allow a broader search: (( _ duncan smith ) or ((( ian duncan sir ) or ( ian duncan sarah )))).
• Adding a wildcard symbol may retrieve word variants: (("_ duncan smith") or ((("ian duncan sir") or ("ian duncan sarah"))))*.