Perhaps you should try some spelling variations:
"supply trade integration theories." » "supply trade integration theory.", "supply trade integration through.", "supply trade integration efforts.", "supply side integration theories.", "supply case integration theories."
"supply asian irrigation scheme." » "supply asian irrigation systems.", "supply basin irrigation scheme.", "supply asian integration scheme.", "supply africa irrigation scheme.", "supply side irrigation scheme.", "supply asset irrigation scheme.", "supply urban irrigation scheme."

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

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