Perhaps you should try some spelling variations:
"desplazados internos dos refugiados" » "desplazados internos los refugiados" (Expand Search), "desplazados internos de refugiados" (Expand Search), "desplazados interno das refugiados" (Expand Search), "desplazados internos con refugiados" (Expand Search)
"desplazados internos y refugiados" » "desplazados internos de refugiados" (Expand Search), "desplazados internos los refugiados" (Expand Search), "desplazados internos y resultados" (Expand Search), "desplazados interno y refugiados" (Expand Search), "desplazados internos e refugiados" (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: (("desplazados internos y refugiados") OR ("desplazados internos dos refugiados"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"desplazados internos y refugiados\") OR (\"desplazados internos dos refugiados\"))".
• Removing quotes may allow a broader search: (( desplazados internos y refugiados ) OR ( desplazados internos dos refugiados )).
• Adding a wildcard symbol may retrieve word variants: (("desplazados internos y refugiados") OR ("desplazados internos dos refugiados"))*.