Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
cost integration » post integration, test integration, about integration
supply fare » supply farm, supply figure, supply curve
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((supply fare) OR (supply case)) irrigation schemes. ) OR ( supply cost integration study. ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((supply fare) OR (supply case)) irrigation schemes. ) or ( supply cost integration study. ))~".
• Adding a wildcard symbol may retrieve word variants: (( ((supply fare) OR (supply case)) irrigation schemes. ) or ( supply cost integration study. ))*.