Perhaps you should try some spelling variations:
"ian duncan smith" » "ian duncan sarah", "ian duncan scott", "brian duncan smith", "ra duncan smith", "a duncan smith"
"colin duncan sir" » "john duncan sir", "colin duncan i", "colin duncan sarah"
"jon duncan sir" » "john duncan sir", "j duncan sir", "jon duncan i", "jon 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 ((("jon duncan sir") OR ("colin duncan sir")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ian duncan smith\") or (((\"jon duncan sir\") OR (\"colin duncan sir\"))))".
• Removing quotes may allow a broader search: (( ian duncan smith ) or ((( jon duncan sir ) OR ( colin duncan sir )))).
• Adding a wildcard symbol may retrieve word variants: (("ian duncan smith") or ((("jon duncan sir") OR ("colin duncan sir"))))*.