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

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