Perhaps you should try some spelling variations:
"support carbon irrigation schemes." » "support carbon irrigation scheme.", "support carbon irrigation systems.", "support carbon mitigation schemes.", "support crop irrigation schemes.", "support canal irrigation schemes.", "supporting carbon irrigation schemes.", "support can irrigation schemes.", "support common irrigation schemes."
"support urban information theory." » "support can information theory.", "support bank information theory.", "support human information theory.", "report urban information theory.", "supply urban information theory."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("support carbon irrigation schemes.") or ("support urban information theory."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support carbon irrigation schemes.") OR ("support urban information theory.")).
• Removing quotes may allow a broader search: (( support carbon irrigation schemes. ) or ( support urban information theory. )).
• Adding a wildcard symbol may retrieve word variants: (("support carbon irrigation schemes.") or ("support urban information theory."))*.