Perhaps you should try some spelling variations:
channel irrigation » change irrigation, canal irrigation, channel integration
irrigation schemes » irrigation scheme, irrigation systems
export channel » export channels
linking crises » banking crises, linking chipset, thinking crisis
duty linking » data linking, city linking, study linking
import duty » import duties

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( export channel irrigation schemes. ) or ( import duty linking crises. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( export channel irrigation schemes. ) OR ( import duty linking crises. ))*.