Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
irrigation schemes » irrigation scheme, irrigation systems
gap international » law international, war international, can international
chain irrigation » change irrigation, basin irrigation, chain integration
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 gap international efforts. ) or ( supply chain irrigation schemes. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply gap international efforts. ) OR ( supply chain irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (( supply gap international efforts. ) or ( supply chain irrigation schemes. ))*.