Perhaps you should try some spelling variations:
social exact » social effect, social etats, social et
etats model » etas model, beats model, hats model
rats model » rat model, rate model, ratio model
social jet » social je, social act, social jetlag
jet model » net model, set 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 ((etats model) OR (rats model)) ))) OR ( social jet model )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( social exact model ) or ( social ((etats model) OR (rats model)) ))) or ( social jet model ))".
• Adding a wildcard symbol may retrieve word variants: (((( social exact model ) or ( social ((etats model) OR (rats model)) ))) or ( social jet model ))*.