Perhaps you should try some spelling variations:
"ian duncan sarah" » "ian duncan adam", "ian duncan gray", "ian duncan shaw", "brian duncan sarah", "a duncan sarah", "jon duncan sarah"
"j duncan smith" » "j duncan sir", "_ duncan smith", "mr duncan smith"
"j duncan scott" » "j duncan scotus", "j duncan stone", "_ duncan scott", "mr duncan scott"

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