Perhaps you should try some spelling variations:
"supply side integration theories." » "supply side integration theorems.", "supply side integrationstheorie 2.", "supply side integration theory.", "supply die integration theories.", "supply de integration theories.", "supply life integration theories."
"supply factor integration schemes." » "supply factor integration schengen.", "supply factor irrigation schemes.", "supply factor integration regimes.", "supply facto integration schemes.", "supply sector integration schemes.", "supply actor interaction schemes.", "supply factors integration schemes."

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 factor integration schemes.") or ("supply side integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply factor integration schemes.") OR ("supply side integration theories.")).
• Removing quotes may allow a broader search: (( supply factor integration schemes. ) or ( supply side integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (("supply factor integration schemes.") or ("supply side integration theories."))*.