Perhaps you should try some spelling variations:
"special respective model" » "special perspective model", "special perspectives model", "special respect model", "special respective modes", "special prospective model"
"special effects models" » "special effect 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 ((("special effects models") OR ("special respective model")))).
• Removing quotes may allow a broader search: (( social exact model ) or ((( special effects models ) or ( special respective model )))).
• Adding a wildcard symbol may retrieve word variants: (("social exact model") or ((("special effects models") or ("special respective model"))))*.