Perhaps you should try some spelling variations:
"support group integration efforts." » "support group international efforts.", "support group conservation efforts.", "support group interaction efforts.", "support group interactions efforts.", "support erp integration efforts.", "support grant integration efforts."
"supply canal irrigation system." » "supply canal irrigation systems.", "supply canal irrigation water.", "supply canal irrigation scheme.", "supply scale irrigation system.", "supply canada irrigation system.", "supply annual irrigation system.", "supply china 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 canal irrigation system.") OR ("support group integration efforts."))~.
• Removing quotes may allow a broader search: (( supply canal irrigation system. ) or ( support group integration efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply canal irrigation system.") or ("support group integration efforts."))*.