Perhaps you should try some spelling variations:
"political theorists" » "political theory", "political aphorisms", "critical theorist", "political theorys", "critical theorists", "political terrorisms"
"political theorist" » "political theory", "critical theorist", "political terrorism"
"political theories" » "political theory", "analytical theories", "physical theories"

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