Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
integration south » integration study, integration some, integration through
case irrigation » scale irrigation, change irrigation, canal irrigation
supply fare » supply farm, supply market, supply water
supply case » supply cost, supply chain, supply costs

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: (( ((supply fare) OR (supply curve)) integration south. ) OR ( supply case irrigation schemes. ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((supply fare) OR (supply curve)) integration south. ) or ( supply case irrigation schemes. ))~".
• Adding a wildcard symbol may retrieve word variants: (( ((supply fare) OR (supply curve)) integration south. ) or ( supply case irrigation schemes. ))*.