Perhaps you should try some spelling variations:
"ian duncan smith" » "ian duncan sir", "a duncan smith", "jon duncan smith", "innes duncan smith"
"brian duncan smith" » "brian duncan sir", "bruce duncan smith", "bra duncan smith", "brjon duncan smith", "brinnes duncan smith"
"ian duncan sarah" » "ian duncan adam", "ian duncan gray", "ian duncan shaw", "a duncan sarah", "jon duncan sarah", "innes duncan sarah"
"ian duncan scott" » "ian duncan scotus", "ian duncan stone", "a duncan scott", "jon duncan scott", "innes 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 smith") OR ("brian duncan smith"))) OR ("ian duncan sarah"))) OR ("ian duncan scott")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"ian duncan smith\") OR (\"brian duncan smith\"))) or (\"ian duncan sarah\"))) or (\"ian duncan scott\"))".
• Removing quotes may allow a broader search: (((((( ian duncan smith ) OR ( brian duncan smith ))) or ( ian duncan sarah ))) or ( ian duncan scott )).
• Adding a wildcard symbol may retrieve word variants: (((((("ian duncan smith") OR ("brian duncan smith"))) or ("ian duncan sarah"))) or ("ian duncan scott"))*.