Perhaps you should try some spelling variations:
"clinical mexicana de medicina interna ;" » "clinicas mexicanas de medicina interna ;", "clinical medicine de medicina interna ;", "cronica mexicana de medicina interna ;"
"clinical mexicana en medicina interna ;" » "clinicas mexicanas en medicina interna ;", "clinical medicine en medicina interna ;", "cronica mexicana en medicina interna ;", "clinical mexicana la medicina interna ;"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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