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