Perhaps you should try some spelling variations:
"supply farmer integration theories." » "supply farmer integration theorems.", "supply farmer integrationstheorie 2.", "supply farmer integration theory.", "supply fare integration theories.", "supply further integration theories.", "supply border integration theories.", "supply farm integration theories."
"supply change information theory." » "supply chandos information theory.", "supply trade information theory.", "supply charges information theory.", "supply channels information theory.", "supply chain's information theory."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply change information theory.") or ("supply farmer integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply change information theory.") OR ("supply farmer integration theories.")).
• Removing quotes may allow a broader search: (( supply change information theory. ) or ( supply farmer integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (("supply change information theory.") or ("supply farmer integration theories."))*.