Perhaps you should try some spelling variations:
"supply case integration theories." » "supply case integration theory.", "supply case integration through.", "supply case integration efforts.", "supply care integration theories.", "supply fare integration theories.", "supply can integration theories.", "supply cost integration theories.", "supply chain integration theories.", "supply curve integration theories."
"supply side irrigation schemes." » "supply side irrigation scheme.", "supply side irrigation systems.", "supply scale irrigation schemes.", "supply under irrigation schemes.", "supply spate irrigation 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 side irrigation schemes.") or ("supply case integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply side irrigation schemes.") OR ("supply case integration theories.")).
• Removing quotes may allow a broader search: (( supply side irrigation schemes. ) or ( supply case integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (("supply side irrigation schemes.") or ("supply case integration theories."))*.