Perhaps you should try some spelling variations:
"valoracion multiple cada de los americas" » "valoracion multiples cada de los americas" (Expand Search), "valoracion multiple cada de los america" (Expand Search)
"valoracion multiple cada de la americano" » "valoracion multiples cada de la americano" (Expand Search), "valoracion multiple cada de la america" (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("valoracion multiple cada de los americas") OR ("valoracion multiple cada de la americano"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"valoracion multiple cada de los americas\") OR (\"valoracion multiple cada de la americano\"))".
• Removing quotes may allow a broader search: (( valoracion multiple cada de los americas ) OR ( valoracion multiple cada de la americano )).
• Adding a wildcard symbol may retrieve word variants: (("valoracion multiple cada de los americas") OR ("valoracion multiple cada de la americano"))*.