Perhaps you should try some spelling variations:
deudas tributarias » deuda tributaria, leyes tributarias, reformas tributarias
ideas tributarias » medidas tributarias, figuras tributarias, normas tributarias
bases tributarias » base tributaria, leyes tributarias, cargas tributarias
dret tributarias » dret tributari, leyes tributarias, y 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 (((ideas tributarias) OR (deudas tributarias))))) or (bases tributarias))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dret tributarias) OR (((ideas tributarias) OR (deudas tributarias))))) OR (bases tributarias)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((dret tributarias) or (((ideas tributarias) OR (deudas tributarias))))) or (bases tributarias))".
• Adding a wildcard symbol may retrieve word variants: ((((dret tributarias) or (((ideas tributarias) OR (deudas tributarias))))) or (bases tributarias))*.