Perhaps you should try some spelling variations:
"export fare irrigation schemes." » "export fare irrigation scheme.", "export fare irrigation systems.", "export farm irrigation schemes.", "export large irrigation schemes.", "export scale irrigation schemes.", "export share irrigation schemes.", "export base irrigation schemes.", "export fair irrigation schemes."
"supply grid information theory." » "supply good information theory.", "supply guided information theory.", "supply rapid information theory.", "supply crowd information theory.", "supply great information theory.", "support grid 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: (("export fare irrigation schemes.") or ("supply grid information theory."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("export fare irrigation schemes.") OR ("supply grid information theory."))*.
• Removing quotes may allow a broader search: (( export fare irrigation schemes. ) or ( supply grid information theory. ))*.