Perhaps you should try some spelling variations:
"delitos economicos en el sector publico" » "delitos economico en el sector publico" (Expand Search), "delitos economicas en el sector publico" (Expand Search), "delitos economicos del el sector publico" (Expand Search), "delitos economicos en del sector publico" (Expand Search)
"derechos economicos en el sector publico" » "derechos economico en el sector publico" (Expand Search), "derechos economicas en el sector publico" (Expand Search), "derechos economicos del el sector publico" (Expand Search), "derechos economicos en del sector publico" (Expand Search)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("delitos economicos en el sector publico") OR ("derechos economicos en el sector publico"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"delitos economicos en el sector publico\") OR (\"derechos economicos en el sector publico\"))".
• Removing quotes may allow a broader search: (( delitos economicos en el sector publico ) OR ( derechos economicos en el sector publico )).
• Adding a wildcard symbol may retrieve word variants: (("delitos economicos en el sector publico") OR ("derechos economicos en el sector publico"))*.