Perhaps you should try some spelling variations:
"import trade interaction series." » "import trade interactions series.", "import trade interaction studies.", "import trade interaction terms.", "import trade integration series.", "import face interaction series.", "import time interaction series.", "export trade interaction series.", "import price interaction series.", "import taxes interaction series."
"supply chain irrigation scheme." » "supply chain irrigation systems.", "supply grain irrigation scheme.", "supply change irrigation scheme.", "supply basin irrigation scheme."

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

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