CMIS - CONTAINS does not return all documents

Hi all,

I'm trying to make case-insensitive queries with and I've found that the CONTAINS method to do so is not working correctly. I've got several documents:

And the queries are working in some cases but in some others they're not:

SELECT F.cmis:name, T.cm:description FROM cmis:document AS F JOIN cm:titled AS T ON F.cmis:objectId=T.cmis:objectId WHERE CONTAINS(T,'cm:description:\'*Asdf*\'') -- 2 results (OK)
SELECT F.cmis:name, T.cm:description FROM cmis:document AS F JOIN cm:titled AS T ON F.cmis:objectId=T.cmis:objectId WHERE CONTAINS(T,'cm:description:\'*asdf*\'') -- 2 results (OK)
SELECT F.cmis:name, T.cm:description FROM cmis:document AS F JOIN cm:titled AS T ON F.cmis:objectId=T.cmis:objectId WHERE CONTAINS(T,'cm:description:\'*Hola*\'') -- 0 results (KO)
SELECT F.cmis:name, T.cm:description FROM cmis:document AS F JOIN cm:titled AS T ON F.cmis:objectId=T.cmis:objectId WHERE CONTAINS(T,'cm:description:\'*hola*\'') -- 0 results (KO)
SELECT F.cmis:name, T.cm:description FROM cmis:document AS F JOIN cm:titled AS T ON F.cmis:objectId=T.cmis:objectId WHERE CONTAINS(T,'cm:description:\'*Sentencia*\'') -- 0 results (KO)
SELECT F.cmis:name, T.cm:description FROM cmis:document AS F JOIN cm:titled AS T ON F.cmis:objectId=T.cmis:objectId WHERE CONTAINS(T,'cm:description:\'*sentencia*\'') -- 0 results (KO)

Is there anything I'm missing??

Thank you!!