Perhaps you should try some spelling variations:
"ra duncan sarah" » "ra duncan adam", "ra duncan gray", "ra duncan shaw", "_ duncan sarah", "mr duncan sarah", "j duncan sarah"
"jon duncan smith" » "jon duncan scott", "john duncan smith", "j duncan smith", "ian duncan smith"
"jon duncan sir" » "john duncan sir", "j duncan sir", "ian duncan sir", "jon duncan i"

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 sarah") OR ((("jon duncan smith") OR ("jon duncan sir")))).
• Removing quotes may allow a broader search: (( ra duncan sarah ) or ((( jon duncan smith ) or ( jon duncan sir )))).
• Adding a wildcard symbol may retrieve word variants: (("ra duncan sarah") or ((("jon duncan smith") or ("jon duncan sir"))))*.