Perhaps you should try some spelling variations:
"support can irrigation schemes." » "support can irrigation scheme.", "support can irrigation systems.", "support canal irrigation schemes.", "support change irrigation schemes.", "support scale irrigation schemes.", "support a irrigation schemes.", "support tax irrigation schemes.", "support carbon irrigation schemes."
"support bank information theory." » "support can information theory.", "support based information theory.", "support urban information theory.", "support grant information theory.", "support basic information theory.", "support plans 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 can irrigation schemes.") or ("support bank information theory."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support can irrigation schemes.") OR ("support bank information theory.")).
• Removing quotes may allow a broader search: (( support can irrigation schemes. ) or ( support bank information theory. )).
• Adding a wildcard symbol may retrieve word variants: (("support can irrigation schemes.") or ("support bank information theory."))*.