Perhaps you should try some spelling variations:
"german ethnic relations." » "german economic relations.", "german ethnicity relations."
"german ethnic question." » "german ethnicity question.", "german ethical question.", "german topic question."
"german public relations." » "germany public relations.", "urban public relations.", "green public relations."

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