Perhaps you should try some spelling variations:
"support group conservation efforts." » "support group cooperation efforts.", "support from conservation efforts.", "support good conservation efforts.", "support grant conservation efforts."
"supply large irrigation systems." » "supply farm irrigation systems.", "supply drip irrigation systems.", "supply scale irrigation systems.", "supply charges irrigation systems.", "supply targets irrigation systems.", "supply curve irrigation systems.", "supply large irrigation system."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("support group conservation efforts.") OR ("supply large irrigation systems."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"support group conservation efforts.\") OR (\"supply large irrigation systems.\"))".
• Removing quotes may allow a broader search: (( support group conservation efforts. ) OR ( supply large irrigation systems. )).
• Adding a wildcard symbol may retrieve word variants: (("support group conservation efforts.") OR ("supply large irrigation systems."))*.