Perhaps you should try some spelling variations:
"historikerin" » "historikern", "historiker", "historikers"
"historia" » "historic"
"historians" » "historicns"
"historicns" » "historicos", "historicas", "historiens"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("historikerin" OR ("historia" OR "histories")) OR (("historians" OR "historicns") OR "historical")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"historikerin\" or (\"historia\" OR \"histories\")) or ((\"historians\" or \"historicns\") or \"historical\"))".
• Removing quotes may allow a broader search: (( historikerin or ( historia OR histories )) or (( historians or historicns ) or historical )).
• Adding a wildcard symbol may retrieve word variants: (("historikerin" or ("historia" OR "histories")) or (("historians" or "historicns") or "historical"))*.