Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
21st international » 1st international, first international, what international
chain information » can information, change information, domain information
supply 21st » supply cost, supply costs, supply asset

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply 21st international efforts. ) or ( supply chain information theory. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply 21st international efforts. ) OR ( supply chain information theory. )).
• Adding a wildcard symbol may retrieve word variants: (( supply 21st international efforts. ) or ( supply chain information theory. ))*.