Perhaps you should try some spelling variations:
"cronicas americanas del medicina interna ;" » "colonias americanas del medicina interna ;", "chicas americanas del medicina interna ;", "cronicas alemanas del medicina interna ;", "cronicas americana de medicina interna ;", "cronicas americanos de medicina interna ;", "cronicas americanas en medicina interna ;", "cronicas americanas del medicinar interna ;", "cronicas americanas de medicina interna ;", "cronicas americanas legal medicina interna ;"
"cronica mexicana en medicina interna ;" » "botanica mexicana en medicina interna ;", "prensa mexicana en medicina interna ;", "cronica mexicana de medicina interna ;", "cronica mexicana la medicina interna ;"

Try widening your search to All Fields.

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