Perhaps you should try some spelling variations:
"supply costs international social." » "supply costs international society.", "supply costs international sourcing.", "supply costs international seminar.", "supply costea international social.", "supply counts international social.", "supply cases international social."
"supply how integration schengen." » "supply how integration changed.", "supply how integration schemes.", "supply how integration challenges.", "supply new integration schengen.", "supply how interaction schengen.", "supply die integration schengen."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply costs international social.") OR ("supply how integration schengen."))~.
• Removing quotes may allow a broader search: (( supply costs international social. ) or ( supply how integration schengen. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply costs international social.") or ("supply how integration schengen."))*.