Perhaps you should try some spelling variations:
irrigation scheme » irrigation systems
sales irrigation » scale irrigation, saline irrigation, water irrigation
improve state » improving state, improve water, improve care
export sales » export shares, export share, export base
banks serve » banks reserve, banks were, bank service

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( export sales irrigation scheme. ) or ( improve state banks serve. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( export sales irrigation scheme. ) OR ( improve state banks serve. )).
• Adding a wildcard symbol may retrieve word variants: (( export sales irrigation scheme. ) or ( improve state banks serve. ))*.