Perhaps you should try some spelling variations:
"clinical mexicanas de medicina internet ;" » "clinicas mexicanas de medicina internet ;", "clinical medicine de medicina internet ;", "clinical mexicanas de mediante internet ;", "clinical mexicanas de medicina integral ;", "clinical mexicana de medicina internet ;", "clinical mexicano de medicina internet ;", "clinical mexicana _ medicina internet ;"
"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 mexicana en medicina interna ;") or ("clinical mexicanas de medicina internet ;"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cronica mexicana en medicina interna ;") OR ("clinical mexicanas de medicina internet ;")).
• Removing quotes may allow a broader search: (( cronica mexicana en medicina interna ; ) or ( clinical mexicanas de medicina internet ; )).
• Adding a wildcard symbol may retrieve word variants: (("cronica mexicana en medicina interna ;") or ("clinical mexicanas de medicina internet ;"))*.