Perhaps you should try some spelling variations:
"politico mexicano en medicina interna ;" » "politica mexicana en medicina interna ;", "politica mexico en medicina interna ;", "politics mexico en medicina interna ;", "politico mexicanos en medicina interna ;", "politico mexicana en medicina interna ;", "politico mexicano de medicina interna ;", "politico mexicano la medicina interna ;"
"politicos mexico en medicina interna ;" » "politica mexico en medicina interna ;", "policy mexico en medicina interna ;", "politicos mexico de medicina interna ;", "politicos mexico la medicina interna ;"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("politico mexicano en medicina interna ;") OR ("politicos mexico en medicina interna ;"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"politico mexicano en medicina interna ;\") OR (\"politicos mexico en medicina interna ;\"))".
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• Adding a wildcard symbol may retrieve word variants: (("politico mexicano en medicina interna ;") OR ("politicos mexico en medicina interna ;"))*.