Perhaps you should try some spelling variations:
"support grass conservation efforts." » "support mass conservation efforts.", "support forests conservation efforts.", "support forest conservation efforts.", "support grant conservation efforts.", "support across conservation efforts.", "support groups conservation efforts."
"support agri irrigation systems." » "support africa irrigation systems.", "support grain irrigation systems.", "support syria irrigation systems.", "support grid irrigation systems.", "support aging irrigation systems.", "support a irrigation systems.", "support agri 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 agri irrigation systems.") or ("support grass conservation efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support agri irrigation systems.") OR ("support grass conservation efforts."))*.
• Removing quotes may allow a broader search: (( support agri irrigation systems. ) or ( support grass conservation efforts. ))*.