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