Perhaps you should try some spelling variations:
irrigation scheme » irrigation systems
canal irrigation » scale irrigation
banking crises » banking services
export canal » export channel, export bans, export cargo
data banking » data linking, late banking, state banking
import data » import duty

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 data banking crises. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( export canal irrigation scheme. ) OR ( import data banking crises. )).
• Adding a wildcard symbol may retrieve word variants: (( export canal irrigation scheme. ) or ( import data banking crises. ))*.