Perhaps you should try some spelling variations:
"supply cost interaction series." » "supply cost interactions series.", "supply cost interaction studies.", "supply cost interaction terms.", "supply host interaction series.", "supply host interactions series.", "supply robot interaction series.", "supply costs interaction series."
"supply farm irrigation system." » "supply farm irrigation systems.", "supply farm irrigation water.", "supply farm irrigation scheme.", "supply scale irrigation system.", "supply canal irrigation system.", "supply from irrigation system.", "support farm irrigation system."

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: (("supply cost interaction series.") OR ("supply farm irrigation system."))~.
• Removing quotes may allow a broader search: (( supply cost interaction series. ) or ( supply farm irrigation system. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply cost interaction series.") or ("supply farm irrigation system."))*.