Perhaps you should try some spelling variations:
"supply trade interaction studies." » "supply trade intervention studies.", "supply trade international studies.", "supply trade interactions series.", "supply trade integration studies.", "supply face interaction studies.", "supply time interaction studies.", "supply case interaction studies."
"supply chains irrigation schemes." » "supply chains irrigation scheme.", "supply chains irrigation systems.", "supply change irrigation schemes.", "supply grain irrigation schemes.", "supply canal irrigation schemes.", "supply chain 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 chains irrigation schemes.") or ("supply trade interaction studies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply chains irrigation schemes.") OR ("supply trade interaction studies."))*.
• Removing quotes may allow a broader search: (( supply chains irrigation schemes. ) or ( supply trade interaction studies. ))*.