Perhaps you should try some spelling variations:
"a duncan smith" » "a duncan sarah", "a duncan scott", "ra duncan smith", "_ duncan smith", "j 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 ((("colin duncan sir") OR ("john duncan sir")))).
• Removing quotes may allow a broader search: (( a duncan smith ) or ((( colin duncan sir ) or ( john duncan sir )))).
• Adding a wildcard symbol may retrieve word variants: (("a duncan smith") or ((("colin duncan sir") or ("john duncan sir"))))*.