Perhaps you should try some spelling variations:
"a duncan smith" » "a duncan sarah", "a duncan scott", "ra duncan smith", "_ duncan smith", "j duncan smith"
"ian duncan sir" » "brian duncan sir", "innes duncan sir", "ian duncan i", "ian duncan sarah"
"jon duncan sir" » "jon duncan i", "jon duncan sarah", "john duncan sir", "j duncan sir", "colin duncan sir"

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