Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
chain international » china international, can international, sharing international
irrigation schemes » irrigation scheme, irrigation systems
curve irrigation » large irrigation, crop irrigation, surface irrigation

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply curve irrigation schemes. ) or ( supply chain international efforts. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply curve irrigation schemes. ) OR ( supply chain international efforts. )).
• Adding a wildcard symbol may retrieve word variants: (( supply curve irrigation schemes. ) or ( supply chain international efforts. ))*.