Perhaps you should try some spelling variations:
"political theorists" » "political theorist", "political theory", "political aphorisms"
"political theories" » "political theory", "analytical theories", "physical theories"
"politische theorie" » "politisch theorie"

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: (("politische theorie") OR ((("political theorists") OR ("political theories")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"politische theorie\") or (((\"political theorists\") OR (\"political theories\"))))".
• Removing quotes may allow a broader search: (( politische theorie ) or ((( political theorists ) OR ( political theories )))).
• Adding a wildcard symbol may retrieve word variants: (("politische theorie") or ((("political theorists") OR ("political theories"))))*.