Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
channels irrigation » change irrigation, canal irrigation, channels information
irrigation schemes » irrigation scheme, irrigation systems
den international » den internationalen, when international, can international
supply channels » supply chains
supply den » supply ann, supply demand, supply design

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

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