Perhaps you should try some spelling variations:
"social jet model" » "social je model", "social act model", "social jetlag model", "social net model", "social set model", "social jnet model", "social jset model", "social jet modele"
"social et model" » "social en model", "social e model", "social etats model", "social net model", "social set model", "social et modele"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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