Perhaps you should try some spelling variations:
dret tributarios » deberes tributarios, datos tributarios, y tributarios
ley tributaria » y tributaria, leyes tributarias, y tributario
tributaria » tributarioa, tributariasa, tributana
tributarios » tributarioos, tributariasos, tributanos
tributari » tributario, tributarias, tributan

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

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