Perhaps you should try some spelling variations:
"doctorate" » "doctorat", "doctoral", "doctorado", "doctoralte", "doctorte", "doctoradote"
"doctorales" » "doctoral", "doctorals", "doctoralss", "doctorados", "doctoralles", "doctorles", "doctoradoles"
"doctorale" » "doctoral", "doctorals", "doctorado", "doctoralle", "doctorle", "doctoradole"
"doctoralle" » "doctoral", "doctorals", "doctoralia", "doctorallle", "doctorlle", "doctoradolle"
"doctoraldo" » "doctorado", "doctorando", "doctorandos", "doctoralldo", "doctorldo", "doctoradoldo"
"doctora" » "doctoral", "doctor", "doctorado"

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: ((("doctorate" OR "doctorales") OR (("doctorale" OR "doctoralle") OR "doctoraldo")) OR "doctora")~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((\"doctorate\" or \"doctorales\") or ((\"doctorale\" OR \"doctoralle\") or \"doctoraldo\")) or \"doctora\")~".
• Removing quotes may allow a broader search: ((( doctorate or doctorales ) or (( doctorale OR doctoralle ) or doctoraldo )) or doctora )~.
• Adding a wildcard symbol may retrieve word variants: ((("doctorate" or "doctorales") or (("doctorale" OR "doctoralle") or "doctoraldo")) or "doctora")*.