Perhaps you should try some spelling variations:
"social aspects models" » "social effects models"
"social je model" » "social jose model", "social age model", "social _ model", "social e model", "social 4e model", "social 6e model"
"social de model" » "social pde model", "social ode model", "social de modele"

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 aspects models") OR ((("social je model") OR ("social de model")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"social aspects models\") or (((\"social je model\") OR (\"social de model\"))))".
• Removing quotes may allow a broader search: (( social aspects models ) or ((( social je model ) OR ( social de model )))).
• Adding a wildcard symbol may retrieve word variants: (("social aspects models") or ((("social je model") OR ("social de model"))))*.