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 basin irrigation schemes." » "supply basin irrigation scheme.", "supply basin irrigation systems.", "supply drip irrigation schemes.", "supply canal irrigation schemes.", "supply farm irrigation schemes.", "supply asia irrigation schemes.", "supply based irrigation schemes.", "supply design 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 side integration theories.") or ("supply basin irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply side integration theories.") OR ("supply basin irrigation schemes.")).
• Removing quotes may allow a broader search: (( supply side integration theories. ) or ( supply basin irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("supply side integration theories.") or ("supply basin irrigation schemes."))*.