Perhaps you should try some spelling variations:
normas tributarias » norma tributaria, reformas tributarias, deudas tributarias
ideas tributarias » deudas tributarias, medidas tributarias, figuras 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 (((bases tributarias) or (normas tributarias))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((dret tributarias) OR (ideas tributarias))) OR (((bases tributarias) OR (normas tributarias)))).
• Adding a wildcard symbol may retrieve word variants: ((((dret tributarias) or (ideas tributarias))) or (((bases tributarias) or (normas tributarias))))*.