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