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"
"a duncan smith" » "a duncan sarah", "a duncan scott", "ra duncan smith", "j duncan smith", "m duncan smith"
"_ duncan smith" » "_ duncan sarah", "_ duncan scott", "_ dunciad smith"
"ian duncan sir" » "brian duncan sir", "jon duncan sir", "innes duncan sir", "ian duncan i", "ian duncan sarah"

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 ("ian duncan sir"))) OR ((("a duncan smith") OR ("_ duncan smith")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"ian duncan smith\") OR (\"ian duncan sir\"))) or (((\"a duncan smith\") or (\"_ duncan smith\"))))".
• Removing quotes may allow a broader search: (((( ian duncan smith ) OR ( ian duncan sir ))) or ((( a duncan smith ) or ( _ duncan smith )))).
• Adding a wildcard symbol may retrieve word variants: (((("ian duncan smith") OR ("ian duncan sir"))) or ((("a duncan smith") or ("_ duncan smith"))))*.