Perhaps you should try some spelling variations:
"supply costs integration theories." » "supply costs integration theory.", "supply costs integration through.", "supply costs integration efforts.", "supply south integration theories.", "supply systems integration theories.", "supply content integration theories."
"supply curve integration schemes." » "supply curve irrigation schemes.", "supply curve integration some.", "supply care integration schemes.", "supply fare integration schemes.", "supply use integration schemes."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply curve integration schemes.") OR ("supply costs integration theories."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply curve integration schemes.\") OR (\"supply costs integration theories.\"))".
• Removing quotes may allow a broader search: (( supply curve integration schemes. ) OR ( supply costs integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (("supply curve integration schemes.") OR ("supply costs integration theories."))*.