Perhaps you should try some spelling variations:
"societal effect model" » "societal effects model", "social effects model", "society effects model", "societal effect models", "societal effects models"
"social effect model" » "social effects model", "special effect model", "local effect model", "social effect models", "social effects models"
"social news model" » "social views model", "social needs model", "social norms model", "social newns model", "social news modul"

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 news model") OR ((("social effect model") OR ("societal effect model"))))*.
• Removing quotes may allow a broader search: (( social news model ) or ((( social effect model ) or ( societal effect model ))))*.