Perhaps you should try some spelling variations:
"cronicas mexicana en medicina interna ;" » "cronica mexicana en medicina interna ;", "cronicas americanas en medicina interna ;", "clinicas mexicanas en medicina interna ;", "cronicas mexicana la medicina interna ;"
"cronicas mexicana de medicina interna ;" » "cronica mexicana de medicina interna ;", "cronicas americanas de medicina interna ;", "clinicas mexicanas de 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: (("cronicas mexicana en medicina interna ;") OR ("cronicas mexicana de medicina interna ;"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cronicas mexicana en medicina interna ;\") OR (\"cronicas mexicana de medicina interna ;\"))*".
• Removing quotes may allow a broader search: (( cronicas mexicana en medicina interna ; ) OR ( cronicas mexicana de medicina interna ; ))*.