Perhaps you should try some spelling variations:
jetlag model » eulag model, lag model, tag model
social jet » social je, social agent
social act » social acts, social acl, social actor
social et » social en, social e, social etats
jet model » net model, set model
act model » fact model, cct model, ct model
et model » net model, set model, et modele

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