Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
china international » iea international, action international, finance international
surface irrigation » scale irrigation
supply surface » supply service, upper surface
supply china » supply chains, supply chain
systems. » system.

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

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