Perhaps you should try some spelling variations:
"Base de datos igualdad tributaria" » "Base de danos igualdad tributaria" (Expand Search), "Base de des igualdad tributaria" (Expand Search), "Base de caso igualdad tributaria" (Expand Search)
"Base de datos igualdad retributiva" » "Base de danos igualdad retributiva" (Expand Search), "Base de des igualdad retributiva" (Expand Search), "Base de caso igualdad retributiva" (Expand Search), "Base de datos igualdad distributiva" (Expand Search), "Base de datos igualdad contributiva" (Expand Search)
base de » bases de (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: (("Base de datos igualdad tributaria") OR ("Base de datos igualdad retributiva"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"Base de datos igualdad tributaria\") OR (\"Base de datos igualdad retributiva\"))".
• Removing quotes may allow a broader search: (( Base de datos igualdad tributaria ) OR ( Base de datos igualdad retributiva )).
• Adding a wildcard symbol may retrieve word variants: (("Base de datos igualdad tributaria") OR ("Base de datos igualdad retributiva"))*.