sharepoint 2013 - Create taxonomyField with powershell -

i need create powershell taxonomyfield. image shows taxonomy. i'm able create taxonomyfield using level1 termset, example bibliotecas (see image below). cant use level 2 termset (for example language)

next code ok me:

create-taxonomyfield   $sitecollectionurl                           $staticname                          $displayname                          $fieldgroup                           $termstoregroupname                          $termsetname 

with hardcode:

create-taxonomyfield   "http://mytestsite/"                           "test"                          "test"                           "grouptest"                           "sites"                           "bibliotecas" 

my problem next instruction:

create-taxonomyfield   "http://mytestsite/"                           "test"                          "test"                           "grouptest"                           "sites"                           "bibliotecas\language" 

what correct sintax level 2 term set? need restrict taxonomy field language