Perhaps you should try some spelling variations:
irrigation system » irrigation systems, irrigation water, irrigation scheme
share irrigation » scale irrigation, spate irrigation, change irrigation
banking series » banking services, making series, banking service
improve state » improving state, improve water, improve care
crises » crisis

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

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