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