Perhaps you should try some spelling variations:
"german ethnic relations." » "german economic relations.", "german public relations.", "german ethnicity relations."
"german ethical question." » "german ethical questions.", "german empirical question.", "german social question.", "german ethnicity question."
"german ethnic question." » "german ethnicity question.", "german topic question.", "german ethnicity questions."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("german ethnic relations.") or ((("german ethnic question.") OR ("german ethical question."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("german ethnic relations.") OR ((("german ethnic question.") OR ("german ethical question."))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"german ethnic relations.\") or (((\"german ethnic question.\") OR (\"german ethical question.\"))))*".
• Removing quotes may allow a broader search: (( german ethnic relations. ) or ((( german ethnic question. ) OR ( german ethical question. ))))*.