Perhaps you should try some spelling variations:
"supply trade interaction series." » "supply trade interactions series.", "supply trade interaction studies.", "supply trade interaction terms.", "supply trade integration series.", "supply face interaction series.", "supply time interaction series.", "supply case interaction series."
"supply grid irrigation systems." » "supply grain irrigation systems.", "supply drip irrigation systems.", "supply gray irrigation systems.", "supply crowd irrigation systems.", "supply great irrigation systems.", "support grid irrigation systems.", "supply grid irrigation system."

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 interaction series.") or ("supply grid irrigation systems."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply trade interaction series.") OR ("supply grid irrigation systems.")).
• Removing quotes may allow a broader search: (( supply trade interaction series. ) or ( supply grid irrigation systems. )).
• Adding a wildcard symbol may retrieve word variants: (("supply trade interaction series.") or ("supply grid irrigation systems."))*.