Perhaps you should try some spelling variations:
"cronicas americanas de medicina interna ;" » "colonias americanas de medicina interna ;", "chicas americanas de medicina interna ;", "cronica mexicana de medicina interna ;", "cronicas americanas del medicina interna ;", "cronicas americana de medicina interna ;", "cronicas americanos de medicina interna ;"
"cronicas americanas de medicina internet ;" » "colonias americanas de medicina internet ;", "chicas americanas de medicina internet ;", "cronica mexicana de medicina internet ;", "cronicas americanas de mediante internet ;", "cronicas americanas de medicina integral ;", "cronicas americanas del medicina internet ;", "cronicas americana de medicina internet ;", "cronicas americanos de medicina 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 americanas de medicina interna ;") OR ("cronicas americanas de medicina internet ;"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cronicas americanas de medicina interna ;\") OR (\"cronicas americanas de medicina internet ;\"))".
• Removing quotes may allow a broader search: (( cronicas americanas de medicina interna ; ) OR ( cronicas americanas de medicina internet ; )).
• Adding a wildcard symbol may retrieve word variants: (("cronicas americanas de medicina interna ;") OR ("cronicas americanas de medicina internet ;"))*.