Perhaps you should try some spelling variations:
"ian duncan smith" » "ian duncan sarah", "ian duncan scott", "brian duncan smith", "jon duncan smith", "innes duncan smith"
"_ duncan smith" » "_ duncan sarah", "_ duncan scott", "_ dunciad smith"
"a duncan sir" » "a duncan i", "a duncan sarah", "ra duncan sir", "j duncan sir", "m duncan sir"

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