Perhaps you should try some spelling variations:
"social etats model" » "social ethics model", "social etas model", "social rats model", "social beats model", "social entats model"
"social net model" » "social news model", "social na model", "social needs model", "social net models"
"social e model" » "social en model", "social e modelli"

Try widening your search to All Fields.

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 etats model") OR ((("social net model") OR ("social e model")))).
• Removing quotes may allow a broader search: (( social etats model ) or ((( social net model ) or ( social e model )))).
• Adding a wildcard symbol may retrieve word variants: (("social etats model") or ((("social net model") or ("social e model"))))*.