Perhaps you should try some spelling variations:
"german ethnicity questions." » "german ethnicity question.", "german ethical questions.", "german ethnic question.", "german authenticity questions.", "gender ethnicity questions.", "given ethnicity questions."
"cohen ethnic relations." » "cohen economic relations.", "co ethnic relations.", "other ethnic relations."
"von public relations." » "non public relations.", "can 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: (((("cohen ethnic relations.") OR ("von public relations."))) OR ("german ethnicity questions."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"cohen ethnic relations.\") OR (\"von public relations.\"))) OR (\"german ethnicity questions.\"))".
• Removing quotes may allow a broader search: (((( cohen ethnic relations. ) OR ( von public relations. ))) OR ( german ethnicity questions. )).
• Adding a wildcard symbol may retrieve word variants: (((("cohen ethnic relations.") OR ("von public relations."))) OR ("german ethnicity questions."))*.