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 farmer integrated surveys." » "supply farmer integrated services.", "supply farmer integrated systems.", "supply further integrated surveys.", "supply water integrated surveys.", "supply battery integrated surveys.", "supply farm integrated surveys."

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

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