Perhaps you should try some spelling variations:
"cronicas americana de medicina interna ;" » "cronicas americanas de medicina interna ;", "cronica mexicana de medicina interna ;", "critica americana de medicina interna ;", "cronicas america de medicina interna ;", "cronicas america del medicina interna ;"
"cronica mexicano de medicina moderna ;" » "cronica mexicana de medicina moderna ;", "critico mexicano de medicina moderna ;", "cronica mexicano de medicina medicina ;"

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: (("cronicas americana de medicina interna ;") OR ("cronica mexicano de medicina moderna ;"))~.
• Removing quotes may allow a broader search: (( cronicas americana de medicina interna ; ) or ( cronica mexicano de medicina moderna ; ))~.
• Adding a wildcard symbol may retrieve word variants: (("cronicas americana de medicina interna ;") or ("cronica mexicano de medicina moderna ;"))*.