Perhaps you should try some spelling variations:
special respective » special perspective, special perspectives, special respect
respective model » respective modes, perspective model, prospective model
social effect » social effects, societal effect, special effect
social exact » social etats, social et, social email
effect model » effect models, effects model, effects models

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 ( special respective model )))).
• Adding a wildcard symbol may retrieve word variants: (( social exact model ) or ((( social effect model ) or ( special respective model ))))*.