Perhaps you should try some spelling variations:
"special request model" » "special respect model", "special request body"
"social effects models" » "social effect models", "special effects models", "social aspects models"
"social exact model" » "social effect model", "social etats model", "social et model"

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 exact model") OR ((("social effects models") OR ("special request model")))).
• Removing quotes may allow a broader search: (( social exact model ) or ((( social effects models ) or ( special request model )))).
• Adding a wildcard symbol may retrieve word variants: (("social exact model") or ((("social effects models") or ("special request model"))))*.