Show only subcategories when click on category

  • Hi guys
    I have a problem
    I want to make this:
    For example when user clicks on category Cars I need to show only sub-categories of this category.
    When he/she click on Truck only sub-categories of Trucks.

    I’ve tried this:
    <?php wp_list_cats('sort_column=id&optioncount=0&use_desc_for_title=0&child_of='); ?>
    but I don’t know what to enter in child_of=??? Please help.

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