Perhaps you should try some spelling variations:
"support can irrigation schemes." » "support can irrigation scheme.", "support can irrigation systems.", "support canal irrigation schemes.", "support tank irrigation schemes.", "support change irrigation schemes.", "support chuan irrigation schemes.", "support bank irrigation schemes.", "support a irrigation schemes."
"support young information theory." » "support your information theory.", "support kong information theory.", "support youth information theory.", "supporting young information theory.", "support aging 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 young information theory."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support can irrigation schemes.") OR ("support young information theory.")).
• Removing quotes may allow a broader search: (( support can irrigation schemes. ) or ( support young information theory. )).
• Adding a wildcard symbol may retrieve word variants: (("support can irrigation schemes.") or ("support young information theory."))*.