Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
integration theories » integration theorems, integrationstheorie 2, integration theory
da international » iea international, sea international, sra international
supply trade » supply case
supply da » supply a, supply data, supply gap

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

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