Perhaps you should try some spelling variations:
"cronica mexicanas de medicina interna ;" » "cronicas americanas de medicina interna ;", "clinicas mexicanas de medicina interna ;", "botanica mexicanas de medicina interna ;", "prensa mexicanas de medicina interna ;", "cronica mexicana de medicina interna ;", "cronica mexicano de medicina interna ;", "cronica mexicana _ 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: (("cronica mexicanas de medicina interna ;") or ("cronica mexicana en medicina interna ;"))~.
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• Removing quotes may allow a broader search: (( cronica mexicanas de medicina interna ; ) or ( cronica mexicana en medicina interna ; )).
• Adding a wildcard symbol may retrieve word variants: (("cronica mexicanas de medicina interna ;") or ("cronica mexicana en medicina interna ;"))*.