Perhaps you should try some spelling variations:
"social exact model" » "social effect model", "social etats model", "social et model"
"social beats model" » "social beasts model", "social etats model", "social bots model", "social seats model", "social nets model"
"social etas model" » "social etats model", "social eclas model", "social et model", "social keras model", "social gas model", "social das 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 exact model") OR ((("social etas model") OR ("social beats model"))))*.
• Removing quotes may allow a broader search: (( social exact model ) or ((( social etas model ) or ( social beats model ))))*.