Perhaps you should try some spelling variations:
"john dunning smith" » "john turning smith", "john dennis smith", "john using smith", "john jennings smith", "john dunton smith"
"brian duncan smith" » "ian duncan smith", "bruce duncan smith", "brian duncan sir", "brian duncan scott"
"jon duncan smith" » "jon duncan sir", "jon duncan scott", "john duncan smith", "j duncan smith", "ian duncan smith"
"jon duncan sarah" » "jon duncan adam", "jon duncan gray", "jon duncan shaw", "john duncan sarah", "j duncan sarah", "ian 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: (("brian duncan smith") OR ((((("jon duncan smith") OR ("jon duncan sarah"))) OR ("john dunning smith")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"brian duncan smith\") or (((((\"jon duncan smith\") OR (\"jon duncan sarah\"))) or (\"john dunning smith\"))))".
• Removing quotes may allow a broader search: (( brian duncan smith ) or ((((( jon duncan smith ) OR ( jon duncan sarah ))) or ( john dunning smith )))).
• Adding a wildcard symbol may retrieve word variants: (("brian duncan smith") or ((((("jon duncan smith") OR ("jon duncan sarah"))) or ("john dunning smith"))))*.