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