Perhaps you should try some spelling variations:
irrigation system » irrigation systems, irrigation water, irrigation scheme
share irrigation » scale irrigation, spate irrigation, change irrigation
state planning » strategic planning, spatial planning
exports share » export share, export shares, exports where
state banking » state banks, state bank

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

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