Perhaps you should try some spelling variations:
"supply tank irrigation schemes." » "supply tank irrigation scheme.", "supply tank irrigation systems.", "supply canal irrigation schemes.", "supply farm irrigation schemes.", "supply ranking irrigation schemes.", "supply ann irrigation schemes.", "supply trade irrigation schemes."
"support grant interaction series." » "support grant interactions series.", "support grant interaction studies.", "support grant interaction terms.", "support graph interaction series.", "support gradient interaction series.", "support plant interactions series."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply tank irrigation schemes.") or ("support grant interaction series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply tank irrigation schemes.") OR ("support grant interaction series."))*.
• Removing quotes may allow a broader search: (( supply tank irrigation schemes. ) or ( support grant interaction series. ))*.