Perhaps you should try some spelling variations:
"cronicas americana de medicina interna ;" » "cronicas americanas de medicina interna ;", "cronica mexicana de medicina interna ;", "critica americana de medicina interna ;", "cronicas america de medicina interna ;", "cronicas america del 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 americanos 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 americana de medicina interna ;") or ("chicas americanas de medicina interna ;"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cronicas americana de medicina interna ;") OR ("chicas americanas de medicina interna ;")).
• Removing quotes may allow a broader search: (( cronicas americana de medicina interna ; ) or ( chicas americanas de medicina interna ; )).
• Adding a wildcard symbol may retrieve word variants: (("cronicas americana de medicina interna ;") or ("chicas americanas de medicina interna ;"))*.