Perhaps you should try some spelling variations:
"caracteristicas psicometricas mediadas." » "caracteristicas fisicoquimicas mediadas.", "caracteristicas quimicas mediadas.", "caracteristicas anatomicas mediadas.", "caracteristicas psicometricas medidas.", "caracteristicas psicometricas medianas.", "caracteristicas psicometricas mediados."
"caracteristicas nacionales mexico." » "caracteristicas nacional mexico.", "caracteristicas sociales mexico."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("caracteristicas nacionales mexico.") or ("caracteristicas psicometricas mediadas."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("caracteristicas nacionales mexico.") OR ("caracteristicas psicometricas mediadas."))*.
• Removing quotes may allow a broader search: (( caracteristicas nacionales mexico. ) or ( caracteristicas psicometricas mediadas. ))*.