Perhaps you should try some spelling variations:
"ra duncan smith" » "ra duncan sarah", "ra duncan sir", "_ duncan smith", "mr duncan smith", "j duncan smith"
"john duncan smith" » "john duncan sarah", "john duncan sir", "john dunton smith", "john dunning smith"
"john duncan scott" » "john duncan scotus", "john duncan stone", "john dunton scott", "john dunning scott"

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