Perhaps you should try some spelling variations:
irrigation scheme » irrigation systems
canal irrigation » scale irrigation
export canal » export channel, export bans, export cargo
import state » import share, port state, import shares
banks series » bank series, banking series, banks erik
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 canal irrigation scheme. ) or ( import state ((banks series) or (banks serve)). ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( export canal irrigation scheme. ) OR ( import state ((banks series) OR (banks serve)). )).
• Adding a wildcard symbol may retrieve word variants: (( export canal irrigation scheme. ) or ( import state ((banks series) or (banks serve)). ))*.