Perhaps you should try some spelling variations:
"cronicas mexicana de medicina interna ;" » "cronica mexicana de medicina interna ;", "cronicas americanas de medicina interna ;", "clinicas mexicanas de medicina interna ;"
"prensa mexicana en medicina interna ;" » "poesia mexicana en medicina interna ;", "prensa mexico en medicina interna ;", "revista mexicana en medicina interna ;", "prensa mexicana la medicina interna ;"

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

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