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

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