Perhaps you should try some spelling variations:
internationale system » internationalen system, international system, international systems
chain internationale » chains international, main international, spain international
integration schengen » integration changed, integration schemes, integration challenges
supply trade » supply case

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

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