Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
canal irrigation » scale irrigation
banking series » banking services, banking service, banking crises
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.

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