Perhaps you should try some spelling variations:
"social etats model" » "social ethics model", "social etas model", "social beats model", "social hats model"
"social rates model" » "social rate model", "social states model", "social roles model", "social rates models", "social bates model"
"social rats model" » "social rate model", "social roots model", "social rank model", "social rat model", "social ratio model"

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 etats model") OR ("social rats model"))) OR ("social rates model")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"social etats model\") OR (\"social rats model\"))) or (\"social rates model\"))".
• Removing quotes may allow a broader search: (((( social etats model ) OR ( social rats model ))) or ( social rates model )).
• Adding a wildcard symbol may retrieve word variants: (((("social etats model") OR ("social rats model"))) or ("social rates model"))*.