Perhaps you should try some spelling variations:
societal effect » societal effects, social effects, society effects
social effect » social effects, special effect, local effect
effects model » effects models, effect models
social exact » social etats, social et, social email
effect model » effect models, effects models, effective 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 effect model ) OR ( societal effect model ))) OR ( special effects model )))).
• Adding a wildcard symbol may retrieve word variants: (( social exact model ) or ((((( social effect model ) or ( societal effect model ))) or ( special effects model ))))*.