Perhaps you should try some spelling variations:
"cronicas americanos de medicina interna ;" » "cronicas americanas de medicina interna ;", "colonias americanas de medicina interna ;", "chicas americanas de medicina interna ;", "cronicas americana de medicina interna ;", "cronicas americano en medicina interna ;"
"cronicas americanos de mediante internet ;" » "cronicas americanas de mediante internet ;", "colonias americanas de mediante internet ;", "chicas americanas de mediante internet ;", "cronicas americana de mediante internet ;", "cronicas americano en mediante internet ;", "cronicas americanos adn mediante internet ;", "cronicas americanos l.e mediante internet ;", "cronicas americanos de mediana internet ;"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("cronicas americanos de medicina interna ;") or ("cronicas americanos de mediante internet ;"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cronicas americanos de medicina interna ;") OR ("cronicas americanos de mediante internet ;")).
• Removing quotes may allow a broader search: (( cronicas americanos de medicina interna ; ) or ( cronicas americanos de mediante internet ; )).
• Adding a wildcard symbol may retrieve word variants: (("cronicas americanos de medicina interna ;") or ("cronicas americanos de mediante internet ;"))*.