Perhaps you should try some spelling variations:
"supply burke integration efforts." » "supply burke international efforts.", "supply burke conservation efforts.", "supply market integration efforts.", "supply europe integration efforts.", "supply fare integration efforts.", "supply curve integration efforts.", "supply curves integration efforts."
"supply spate irrigation scheme." » "supply spate irrigation systems.", "supply scale irrigation scheme.", "supply water irrigation scheme.", "supply surge irrigation scheme.", "supply system irrigation scheme.", "supply side 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: (("supply burke integration efforts.") OR ("supply spate irrigation scheme."))~.
• Removing quotes may allow a broader search: (( supply burke integration efforts. ) or ( supply spate irrigation scheme. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply burke integration efforts.") or ("supply spate irrigation scheme."))*.