Perhaps you should try some spelling variations:
"support fare irrigation schemes." » "support fare irrigation scheme.", "support fare irrigation systems.", "support farm irrigation schemes.", "support large irrigation schemes.", "support scale irrigation schemes.", "support falls irrigation schemes.", "support trade irrigation schemes.", "support water irrigation schemes."
"support state interaction term." » "support state interactions term.", "support state intervention term.", "support face interaction term.", "support state interaction _.", "support staff interaction term.", "support strategy interaction term.", "support estimate interaction term."

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: (("support state interaction term.") OR ("support fare irrigation schemes."))~.
• Removing quotes may allow a broader search: (( support state interaction term. ) or ( support fare irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support state interaction term.") or ("support fare irrigation schemes."))*.