Perhaps you should try some spelling variations:
"special respect de" » "special aspects de", "special report de", "special request de", "special respect _"
"special effect model" » "special effects model", "spectral effects model", "social effects model", "special effects models", "special effective model"
"special effect models" » "special effects models", "spectral effects models", "social effects models", "special effects modelss", "special effective 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 effect model") OR ("special effect models"))) OR ("special respect de")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"social exact model\") or (((((\"special effect model\") OR (\"special effect models\"))) or (\"special respect de\"))))".
• Removing quotes may allow a broader search: (( social exact model ) or ((((( special effect model ) OR ( special effect models ))) or ( special respect de )))).
• Adding a wildcard symbol may retrieve word variants: (("social exact model") or ((((("special effect model") OR ("special effect models"))) or ("special respect de"))))*.