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