Perhaps you should try some spelling variations:
"social effects models" » "special effects models", "social aspects models", "social effect models"
"social etats model" » "social ethics model", "social etas model", "social rats model", "social beats model", "social enats model", "social eats model"
"social et model" » "social en model", "social e model", "social net model", "social set model", "social jet 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 et model") OR ("social etats model"))) OR ("social effects models")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"social et model\") OR (\"social etats model\"))) or (\"social effects models\"))".
• Removing quotes may allow a broader search: (((( social et model ) OR ( social etats model ))) or ( social effects models )).
• Adding a wildcard symbol may retrieve word variants: (((("social et model") OR ("social etats model"))) or ("social effects models"))*.