Perhaps you should try some spelling variations:
"studien zur deutschen literacy survey" » "studien zur deutschen literatur survey", "studien zum deutschen literacy survey", "studien der deutschen literacy survey", "studien fur deutsche literacy survey", "studien fur deutschen literacy survey", "studien zur deutschn literacy survey"
"studies zur deutsche literatur survey" » "studies zur deutschen literatur survey", "studies zur deutsche literature survey", "studies zur deutsche literature surveys", "studies zur deutsche literatur series", "studies fur deutsche literatur survey", "studies zur deutsch literatur survey", "studies der deutsche literatur survey", "studie zur deutsche literatur survey"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"studies zur deutsche literatur survey\") OR (\"studien zur deutschen literacy survey\"))~".
• Removing quotes may allow a broader search: (( studies zur deutsche literatur survey ) OR ( studien zur deutschen literacy survey ))~.
• Adding a wildcard symbol may retrieve word variants: (("studies zur deutsche literatur survey") OR ("studien zur deutschen literacy survey"))*.