Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
canal irrigation » scale irrigation
export canal » export channel, export bans, export cargo
data banking » data taking, data linking, data asking
import data » import duty
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 canal irrigation schemes. ) or ( import data banking crises. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( export canal irrigation schemes. ) OR ( import data banking crises. ))*.