Perhaps you should try some spelling variations:
"export trade integration series." » "export trade integration theories.", "export trade integrating services.", "export trade integration schemes.", "export share integration series.", "export taxes integration series.", "export price integration series."
"supply case irrigation systems." » "supply scale irrigation systems.", "supply change irrigation systems.", "supply canal irrigation systems.", "supply cost irrigation systems.", "supply chain irrigation systems.", "supply curve irrigation systems.", "supply case 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: (("export trade integration series.") or ("supply case irrigation systems."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("export trade integration series.") OR ("supply case irrigation systems.")).
• Removing quotes may allow a broader search: (( export trade integration series. ) or ( supply case irrigation systems. )).
• Adding a wildcard symbol may retrieve word variants: (("export trade integration series.") or ("supply case irrigation systems."))*.