Perhaps you should try some spelling variations:
"a historian" » "_ historian", "una historia"
"a historic" » "a history"
"a historical" » "a historyal"
"_ historic" » "_ historical", "_ history"

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: (((((((("a historian") OR ("a historic"))) OR ("a historical"))) OR ("la historia"))) OR ("_ historic"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"a historian\") OR (\"a historic\"))) or (\"a historical\"))) or (\"la historia\"))) or (\"_ historic\"))*".
• Removing quotes may allow a broader search: (((((((( a historian ) OR ( a historic ))) or ( a historical ))) or ( la historia ))) or ( _ historic ))*.