Perhaps you should try some spelling variations:
"difference and function relationship" » "difference and function relationships", "different and function relationship"
"differences and function relationship" » "differences and function relationships", "differents and function relationship"

Try widening your search to All Fields.

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: "((\"difference and function relationship\") OR (\"differences and function relationship\"))".
• Removing quotes may allow a broader search: (( difference and function relationship ) OR ( differences and function relationship )).
• Adding a wildcard symbol may retrieve word variants: (("difference and function relationship") OR ("differences and function relationship"))*.