Perhaps you should try some spelling variations:
"historian" » "historians", "historia"
"historien" » "historians", "historiker", "historia", "historian"
"histories" » "historias"
"historie" » "historia"
"historikerin" » "historiker", "historikers"
"historikern" » "historiker"

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: (("historian" OR (("histories" OR ("historien" OR "historie")) OR ("historikerin" OR "historikern"))) OR ("historical" OR "historic")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"historian\" or ((\"histories\" or (\"historien\" OR \"historie\")) or (\"historikerin\" or \"historikern\"))) or (\"historical\" or \"historic\"))".
• Removing quotes may allow a broader search: (( historian or (( histories or ( historien OR historie )) or ( historikerin or historikern ))) or ( historical or historic )).
• Adding a wildcard symbol may retrieve word variants: (("historian" or (("histories" or ("historien" OR "historie")) or ("historikerin" or "historikern"))) or ("historical" or "historic"))*.