Perhaps you should try some spelling variations:
"historien" » "historian", "historie", "historikern"
"historias" » "historian", "historiae", "historical", "historics", "historicals"
"historians" » "historicns", "historicalns"
"historia" » "historic", "historical"

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