Perhaps you should try some spelling variations:
figuras tributarias » deudas tributarias, ideas tributarias, reformas tributarias
delitos tributarios » delito tributario, creditos tributarios, datos tributarios
dret tributarias » dret tributari, leyes tributarias, bases tributarias
base tributaria » bases tributarias, tasa tributaria, gaceta tributaria

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((dret tributarias) or (figuras tributarias))) or (((delitos tributarios) or (base tributaria))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dret tributarias) OR (figuras tributarias))) OR (((delitos tributarios) OR (base tributaria)))).
• Adding a wildcard symbol may retrieve word variants: ((((dret tributarias) or (figuras tributarias))) or (((delitos tributarios) or (base tributaria))))*.