Perhaps you should try some spelling variations:
"social aspects models" » "social effects models"
"social net model" » "social news model", "social na model", "social needs model", "social nset model", "social njet model", "social net modele"
"social et model" » "social en model", "social e model", "social etats model", "social set model", "social jet model", "social 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 net model"))) OR ("social aspects models")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"social et model\") OR (\"social net model\"))) or (\"social aspects models\"))".
• Removing quotes may allow a broader search: (((( social et model ) OR ( social net model ))) or ( social aspects models )).
• Adding a wildcard symbol may retrieve word variants: (((("social et model") OR ("social net model"))) or ("social aspects models"))*.