Perhaps you should try some spelling variations:
internationale policy » international policy, internationale politik, internationalen politik
cause internationale » case international, das internationale, als internationale
supply scale » supply case, supply scheme, supply social
supply cause » supply case, supply curve, supply cost
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 scale irrigation systems. ) or ( supply cause internationale policy. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply scale irrigation systems. ) OR ( supply cause internationale policy. )).
• Adding a wildcard symbol may retrieve word variants: (( supply scale irrigation systems. ) or ( supply cause internationale policy. ))*.