Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
shock irrigation » scale irrigation, crop irrigation, flood irrigation
gap information » sap information, amp information, erp information
supply shock » supply shocks
supply gap » supply a

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply shock irrigation schemes. ) or ( supply gap information services. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply shock irrigation schemes. ) OR ( supply gap information services. )).
• Adding a wildcard symbol may retrieve word variants: (( supply shock irrigation schemes. ) or ( supply gap information services. ))*.