Perhaps you should try some spelling variations:
"social theorists" » "social theories", "social theorizing", "social theory", "social theoriess", "social theorys", "sociale theories"
"social theorist" » "social theories", "social theory", "sociale theorie"
"formal theory" » "local 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 ("social theorists"))) OR ((("formal theories") OR ("formal theory")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"social theorist\") or (\"social theorists\"))) or (((\"formal theories\") OR (\"formal theory\"))))".
• Removing quotes may allow a broader search: (((( social theorist ) or ( social theorists ))) or ((( formal theories ) OR ( formal theory )))).
• Adding a wildcard symbol may retrieve word variants: (((("social theorist") or ("social theorists"))) or ((("formal theories") OR ("formal theory"))))*.