Perhaps you should try some spelling variations:
"concepto juridico del nivel" » "concepto juridico el nivel" (Expand Search)
"concepto juridico de nivel" » "concepto juridico a nivel" (Expand Search), "concepto juridico el nivel" (Expand Search)
"concepto juridico de nava" » "concepto juridico de nave" (Expand Search), "concepto juridico de nacao" (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: (("concepto juridico de nava") OR ((("concepto juridico de nivel") OR ("concepto juridico del nivel"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"concepto juridico de nava\") OR (((\"concepto juridico de nivel\") OR (\"concepto juridico del nivel\"))))".
• Removing quotes may allow a broader search: (( concepto juridico de nava ) OR ((( concepto juridico de nivel ) OR ( concepto juridico del nivel )))).
• Adding a wildcard symbol may retrieve word variants: (("concepto juridico de nava") OR ((("concepto juridico de nivel") OR ("concepto juridico del nivel"))))*.