Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
integration south » integration study, integration some, integration through
canal irrigation » scale irrigation
supply canal » supply annual, supply rural, supply data
supply case » supply chain, supply curve, supply costs
supply cost » supply costs

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( ((supply case) OR (supply cost)) integration south. ) or ( supply canal irrigation schemes. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((supply case) OR (supply cost)) integration south. ) OR ( supply canal irrigation schemes. ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((supply case) OR (supply cost)) integration south. ) or ( supply canal irrigation schemes. ))*".