which river's source place is vanga mică river and mouth in valea poienii river ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_sourcePlace dbr_Vanga_Mică_River sep_dot var_uri dbo_riverMouth dbr_Valea_Poienii_River_ attr_open Ghimbășel attr_close sep_dot var_uri a dbo_River brack_close