Perhaps you should try some spelling variations:
"supply crowd integration theory." » "supply crowd integration through.", "supply crowd information theory.", "supply crowd integration report.", "supply grid integration theory.", "supply trade integration theory.", "supply chain integration theory.", "supply growth integration theory.", "supply cost integration theory.", "supply how integration theory."
"supply crowd irrigation schemes." » "supply crowd irrigation scheme.", "supply crowd irrigation systems.", "supply crop irrigation schemes.", "supply flood irrigation schemes.", "supply from irrigation schemes.", "supply growth irrigation schemes.", "supply cost irrigation schemes.", "supply how irrigation 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 crowd integration theory.") or ("supply crowd irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply crowd integration theory.") OR ("supply crowd irrigation schemes.")).
• Removing quotes may allow a broader search: (( supply crowd integration theory. ) or ( supply crowd irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("supply crowd integration theory.") or ("supply crowd irrigation schemes."))*.