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 tool irrigation schemes." » "supply tool irrigation scheme.", "supply tool irrigation systems.", "supply total irrigation schemes.", "supply flood irrigation schemes.", "supply local irrigation schemes.", "supply school irrigation schemes.", "support tool irrigation schemes.", "supply donor 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 cost interaction series.") or ("supply tool irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply cost interaction series.") OR ("supply tool irrigation schemes.")).
• Removing quotes may allow a broader search: (( supply cost interaction series. ) or ( supply tool irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("supply cost interaction series.") or ("supply tool irrigation schemes."))*.