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."
"can public relations." » "urban 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 ("can public relations."))) or ("german ethnicity questions."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cohen ethnic relations.") OR ("can public relations."))) OR ("german ethnicity questions.")).
• Removing quotes may allow a broader search: (((( cohen ethnic relations. ) or ( can public relations. ))) or ( german ethnicity questions. )).
• Adding a wildcard symbol may retrieve word variants: (((("cohen ethnic relations.") or ("can public relations."))) or ("german ethnicity questions."))*.