Perhaps you should try some spelling variations:
"social theorists" » "social theories", "social theorizing", "social theory", "social theoriess", "social theorys", "social theorizings"
"social theorist" » "social theories", "social theory", "social theorizing"
"sociale theorie" » "social theories", "social theory", "formale theorie"
"formal theories" » "formal theory"

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