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

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) OR (social e)))) model ) OR ( social effect model )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((social exact) or (((social et) OR (social e)))) model ) or ( social effect model ))".
• Adding a wildcard symbol may retrieve word variants: (( ((social exact) or (((social et) OR (social e)))) model ) or ( social effect model ))*.