Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
rate international » rates international, trade international, raise international
irrigation scheme » irrigation systems
case irrigation » scale irrigation, use irrigation, change irrigation
supply case » supply cost, supply chain, supply curve
supply rate » supply rates, supply water, supply data

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 case irrigation scheme. ) OR ( supply rate international efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply case irrigation scheme. ) or ( supply rate international efforts. ))*.