Perhaps you should try some spelling variations:
"doctorat" » "doctor", "doctors", "doctores", "doctort"
"doctorates" » "doctores", "doctorses", "doctoreses", "doctorales", "doctorate", "doctortes"
"doctorale" » "doctorales", "doctorate", "doctorals", "doctorle"
"doctoral" » "doctorl"
"doctorado" » "doctordo"
"doctora" » "doctor"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((("doctorat" or ("doctorates" or "doctoral")) or ("doctorale" or "doctorado")) or "doctora")~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((("doctorat" OR ("doctorates" OR "doctoral")) OR ("doctorale" OR "doctorado")) OR "doctora").
• Removing quotes may allow a broader search: ((( doctorat or ( doctorates or doctoral )) or ( doctorale or doctorado )) or doctora ).
• Adding a wildcard symbol may retrieve word variants: ((("doctorat" or ("doctorates" or "doctoral")) or ("doctorale" or "doctorado")) or "doctora")*.