Perhaps you should try some spelling variations:
"cronicas americanos de medicina interna ;" » "cronicas americanas de medicina interna ;", "colonias americanas de medicina interna ;", "clasicos americanos de medicina interna ;", "cronicas americana de medicina interna ;", "cronicas americano en medicina interna ;"
"chicas americanas de medicina interna ;" » "cronicas americanas de medicina interna ;", "cartas americanas de medicina interna ;", "chino americana de medicina interna ;", "chicas americanas del medicina interna ;", "chicas americana de medicina interna ;", "chicas americanos del medicina interna ;"

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 ("chicas americanas de medicina interna ;"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cronicas americanos de medicina interna ;\") OR (\"chicas americanas de medicina interna ;\"))".
• Removing quotes may allow a broader search: (( cronicas americanos de medicina interna ; ) OR ( chicas americanas de medicina interna ; )).
• Adding a wildcard symbol may retrieve word variants: (("cronicas americanos de medicina interna ;") OR ("chicas americanas de medicina interna ;"))*.