Perhaps you should try some spelling variations:
social effect » social effects, societal effect, special effect
social etats » social ethics
effect model » effect models, effects model, effects models
etats model » etas model, rats model, beats 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 effect model )).
• Adding a wildcard symbol may retrieve word variants: (( social etats model ) or ( social effect model ))*.