Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
china international » iea international, action international, finance international
irrigation schemes » irrigation scheme, irrigation systems
curve irrigation » surge irrigation, large irrigation, crop irrigation
supply china » supply chains, supply chain

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