Perhaps you should try some spelling variations:
societal effect » societal effects, social effects, society effects
social exact » social effect, social etats, social email
effect model » effect models, effects model, effects models
social et » social en, social e, social etats

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) OR (social et)) model ) OR ( societal effect model )).
• Adding a wildcard symbol may retrieve word variants: (( ((social exact) or (social et)) model ) or ( societal effect model ))*.