Perhaps you should try some spelling variations:
"doctorate" » "doctorat", "doctoral", "doctoralte", "doctorte"
"doctorado" » "doctoral", "doctoraldo", "doctordo"
"doctorales" » "doctoral", "doctorals", "doctoralss", "doctorats", "doctoralles", "doctorles"
"doctorale" » "doctoral", "doctorals", "doctorat", "doctoralle", "doctorle"
"doctoraldo" » "doctorando", "doctorandos", "doctoral", "doctoralldo", "doctorldo"
"doctora" » "doctoral", "doctor"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("doctorate" OR "doctorado") or "doctorales") or ("doctorale" or "doctoraldo")) or "doctora")~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doctorate" OR "doctorado") OR "doctorales") OR ("doctorale" OR "doctoraldo")) OR "doctora").
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"doctorate\" OR \"doctorado\") or \"doctorales\") or (\"doctorale\" or \"doctoraldo\")) or \"doctora\")".
• Removing quotes may allow a broader search: (((( doctorate OR doctorado ) or doctorales ) or ( doctorale or doctoraldo )) or doctora ).
• Adding a wildcard symbol may retrieve word variants: (((("doctorate" OR "doctorado") or "doctorales") or ("doctorale" or "doctoraldo")) or "doctora")*.