Perhaps you should try some spelling variations:
deudas tributarias » deuda tributaria, leyes tributarias, reformas tributarias
cargas tributarias » carga tributaria, tarifas tributarias, normas tributarias
bases tributarias » base tributaria, leyes tributarias, datos tributarios
dret tributarias » dret tributari, leyes tributarias, ideas tributarias

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 (deudas tributarias))) or (((bases tributarias) OR (cargas tributarias))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dret tributarias) OR (deudas tributarias))) OR (((bases tributarias) OR (cargas tributarias)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((dret tributarias) or (deudas tributarias))) or (((bases tributarias) OR (cargas tributarias))))".
• Adding a wildcard symbol may retrieve word variants: ((((dret tributarias) or (deudas tributarias))) or (((bases tributarias) OR (cargas tributarias))))*.