Perhaps you should try some spelling variations:
"clinical mexicano de medicina internet ;" » "clinicas mexicanas de medicina internet ;", "clinical medicine de medicina internet ;", "clinica medica de medicina internet ;", "clinical mexicano de medicina interna ;", "clinical mexicano de mediante internet ;", "clinical mexicano de medicina integral ;"
"clinical mexicana de medicina internet ;" » "clinical mexicana de medicina interna ;", "clinical mexicana de mediante internet ;", "clinical mexicana de medicina integral ;", "clinicas mexicanas de medicina internet ;", "clinical medicine de medicina internet ;", "cronica mexicana de medicina internet ;"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("clinical mexicano de medicina internet ;") OR ("clinical mexicana de medicina internet ;"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"clinical mexicano de medicina internet ;\") OR (\"clinical mexicana de medicina internet ;\"))".
• Removing quotes may allow a broader search: (( clinical mexicano de medicina internet ; ) OR ( clinical mexicana de medicina internet ; )).
• Adding a wildcard symbol may retrieve word variants: (("clinical mexicano de medicina internet ;") OR ("clinical mexicana de medicina internet ;"))*.