Show all child terms in user page
First, create a new term view using the fields row style / unformatted list of fields (it is important that the tree style not be chosen now). Then:

Add relationship for taxonomy term: parent term
Add field term id (do not use relationship) and exclude it from display
Add field term id with relationship, exclude from display
Add any fields you want to display, like term name, term description, etc...
Change style / format plugin to Tree (Adjacency model)
Set Main field to Term ID
Set Parent field to Term ID with parent relationship


For details refer 
https://www.drupal.org/node/1493366

https://www.drupal.org/project/views_tree (Compatibility and Usage)