dt tag it doesn't have id attribute at search method on documentation of Model
This link[0] it should work, but it doesn't because the id attribute is missing at the *dt* tag.
[0] http://doc.tryton.org/4.4/trytond/doc/ref/models/models.html?highlight=table_query#trytond.model.ModelSQL.search
Also tested on 4.6 (current release) and didn't work.