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