Perhaps you should try some spelling variations:
international institute » international institutions, national institute, international investment
erwin schrodinger » der schrodinger
die schrodinger » _ schrodinger

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• If you are trying to use Boolean operators, they must be ALL CAPS: "((erwin schrodinger) OR (die schrodinger)) international institute for mathematical (physics" OR physical").
• Removing quotes may allow a broader search: ((erwin schrodinger) or (die schrodinger)) international institute for mathematical (physics OR physical ).
• Adding a wildcard symbol may retrieve word variants: "((erwin schrodinger) or (die schrodinger)) international institute for mathematical (physics" OR physical")*.