Perhaps you should try some spelling variations:
"cronicas americanas de medicina interna ;" » "colonias americanas de medicina interna ;", "chicas americanas de medicina interna ;", "cronica mexicana de medicina interna ;", "cronicas americanas del medicina interna ;", "cronicas americana de medicina interna ;", "cronicas americanos de medicina interna ;"
"prensa mexico del medicina moderna ;" » "prensa mexico del medicina medicina ;", "press mexico del medicina moderna ;", "prensa mexico del medicinar moderna ;", "prensa mexico en medicina moderna ;", "prensa mexico legal medicina moderna ;", "prensa mexico de medicina moderna ;"

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

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