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