Perhaps you should try some spelling variations:
registros clinicos » registro clinico, registros calificados, registros medicos
registros sonicos » registros medicos, registros semioticos, registros historicos
registro medica » registro medico, registro medicos, registros medicos
en estadistica » la estadistica, de estadistica
medica y » medicina y, medica en, medica de

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( registro medica y estadistica de salud ) or ( ((registros sonicos) OR (registros clinicos)) en estadistica de salud ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( registro medica y estadistica de salud ) OR ( ((registros sonicos) OR (registros clinicos)) en estadistica de salud )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( registro medica y estadistica de salud ) or ( ((registros sonicos) OR (registros clinicos)) en estadistica de salud ))".
• Adding a wildcard symbol may retrieve word variants: (( registro medica y estadistica de salud ) or ( ((registros sonicos) OR (registros clinicos)) en estadistica de salud ))*.

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