Perhaps you should try some spelling variations:
"ian duncan smith" » "ian duncan sarah", "ian duncan scott", "brian duncan smith", "a duncan smith", "innes duncan smith"
"john duncan sir" » "john dunton sir", "john dunning sir", "john duncan sarah"
"jon duncan sir" » "j duncan sir", "jon duncan sarah"
"colin duncan i" » "colin duncan _", "colin duncan m", "colin duncan c"

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