Perhaps you should try some spelling variations:
"colin duncan sir" » "john duncan sir", "colin duncan i", "colin duncan sarah"
"a duncan smith" » "a duncan sarah", "a duncan scott", "ra duncan smith", "_ duncan smith", "m duncan smith"
"jon duncan sir" » "john duncan sir", "ian duncan sir", "jon duncan i", "jon duncan sarah"
"j duncan sir" » "j duncan i", "j duncan sarah", "_ duncan sir", "mr 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: (("a duncan smith") OR ((((("jon duncan sir") OR ("j duncan sir"))) OR ("colin duncan sir")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"a duncan smith\") or (((((\"jon duncan sir\") OR (\"j duncan sir\"))) or (\"colin duncan sir\"))))".
• Removing quotes may allow a broader search: (( a duncan smith ) or ((((( jon duncan sir ) OR ( j duncan sir ))) or ( colin duncan sir )))).
• Adding a wildcard symbol may retrieve word variants: (("a duncan smith") or ((((("jon duncan sir") OR ("j duncan sir"))) or ("colin duncan sir"))))*.