Perhaps you should try some spelling variations:
"ian duncan smith" » "ian duncan sarah", "ian duncan sir", "ian duncan scott", "brian duncan smith", "ra duncan smith", "a duncan smith"
"jon duncan smith" » "jon duncan sarah", "jon duncan sir", "jon duncan scott", "john duncan smith", "j duncan smith", "colin duncan smith"

You may be able to get more results by adjusting your search query.

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