SELECT with LIKE and LEFT JOIN

Hello, I'm trying to fetch records based on the name of the stone and the tags.

Tables:

** Tabela tag **
----------------
id       nome
----------------
1        Sem categoria
2        cs
3        weapon
4        balrog


** Tabela tag_relac **
----------------------
id_tag       id_pedra
----------------------
1        50
1        51
1        60
2        60
3        60
4        60    


** Tabela pedras **
-------------------
id         nome
-------------------
50        Teste
51        Teste 2
60        Balrog-1 Blue Explosion   

If I set the stone name, it works.

SELECT pedras.nome, GROUP_CONCAT(DISTINCT tag.nome ORDER BY tag.nome ASC SEPARATOR ', ') AS tags FROM pedras LEFT JOIN tag_relac ON pedras.id = tag_relac.id_pedra LEFT JOIN tag ON tag_relac.id_tag = tag.id WHERE pedras.nome LIKE '%balrog%' OR tag.nome LIKE '%weapon%' GROUP BY pedras.id ORDER BY pedras.nome ASC

Now, if I set the name of the tag, it only returns the one relative to the name.

SELECT pedras.nome, GROUP_CONCAT(DISTINCT tag.nome ORDER BY tag.nome ASC SEPARATOR ', ') AS tags FROM pedras LEFT JOIN tag_relac ON pedras.id = tag_relac.id_pedra LEFT JOIN tag ON tag_relac.id_tag = tag.id WHERE pedras.nome LIKE '%teste%' OR tag.nome LIKE '%weapon%' GROUP BY pedras.id ORDER BY pedras.nome ASC

Any ideas?