Perhaps you should try some spelling variations:
"supply trade integration theories." » "supply trade integration theorems.", "supply trade integrationstheorie 2.", "supply trade integration theory.", "supply case 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."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply trade integration theories.") OR ("supply basin irrigation schemes."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply trade integration theories.\") OR (\"supply basin irrigation schemes.\"))*".
• Removing quotes may allow a broader search: (( supply trade integration theories. ) OR ( supply basin irrigation schemes. ))*.