Perhaps you should try some spelling variations:
"supply shock integration theories." » "supply shock integration theory.", "supply shock integration through.", "supply shock integration efforts.", "supply social integration theories.", "supply chain integration theories.", "supply gvc integration theories.", "supply shocks integration theories."
"supply tool integration schemes." » "supply tool irrigation schemes.", "supply tool integration some.", "supply global integration schemes.", "supply social integration schemes.", "supply trade integration schemes.", "supply school integration schemes.", "support tool 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 shock integration theories.") or ("supply tool integration schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply shock integration theories.") OR ("supply tool integration schemes.")).
• Removing quotes may allow a broader search: (( supply shock integration theories. ) or ( supply tool integration schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("supply shock integration theories.") or ("supply tool integration schemes."))*.