vertical submenu not showing bootstrap

I am trying to build a bootstrap submenu vertically. All goes well till I decide to a add 3rd level submenu. 3rd level submenu is not visible. The screenshot is at here

The code goes like:

<ul class="nav nav-pills nav-stacked col-md-5">
  <li><a href="#">About Us</a></li>
  <li class="active"><a href="#tab_a" data-toggle="pill">Genesis</a></li>
  <li><a href="#tab_b" data-toggle="pill">Mandate</a></li>
  <li><a href="#tab_c" data-toggle="pill">Our Leaders</a></li>
  <li role="presentation" class="dropdown">
    <a class="dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">
      Organization <span class="caret"></span>
    </a>
    <ul class="dropdown-menu">
      <li><a href="/index.php/about-us/organization/governing-council">Governing Council</a></li>
      <li><a href="/index.php/about-us/organization/by-laws">By Laws</a></li>
      <li><a href="/index.php/about-us/organization/moa-rules">MOA &amp; Rules</a></li>
      <li><a href="/index.php/about-us/organization/purchase-procedures">Purchase Procedures</a></li>
      <li><a href="/index.php/about-us/organization/recruitment-rules">Recruitment Rules</a></li>
   </ul>
</li>
<li><a href="/index.php/about-us/annual-report">Annual Report</a></li>

  <li class="dropdown">
    <a class="dropdown-toggle" data-toggle="dropdown" href="#">Glorious Past
    <span class="caret"></span></a>
    <ul class="dropdown-menu">
        <li role="presentation" class="dropdown"> <!-- TV 2020 starts -->
        <a class="dropdown-toggle" data-toggle="dropdown" href="#">Technology Vision 2020
    <span class="caret"></span></a>

            <ul class="dropdown-menu">
                <li><a href="/index.php/about-us/glorious-past/technology-vision-2020/agriculture">Agriculture</a></li>
                <li><a href="/index.php/about-us/glorious-past/technology-vision-2020/agro-food-processing">Agro-food Processing</a></li>
                <li><a href="/index.php/about-us/glorious-past/technology-vision-2020/healthcare-herbal-natural-products">Healthcare &amp; herbal/natural products</a></li>
                <li><a href="/index.php/about-us/glorious-past/technology-vision-2020/bioprocess-bio-products">Bioprocess &amp; Bio products</a></li>
                <li><a href="/index.php/about-us/glorious-past/technology-vision-2020/mission-reach">Mission Reach</a></li>

            </ul>
        </li>   <!-- TV 2020 ends -->
            <li><a href="/index.php/about-us/glorious-past/home-grown-technology-programme">Home Grown Technology Programme</a></li>
            <li><a href="/index.php/about-us/glorious-past/collaborative-automotive-r-d-car">Collaborative Automotive R &amp; D (CAR)</a></li>
            <li><a href="/index.php/about-us/glorious-past/synergizing-s-t-with-judicial-processes">Synergizing S &amp; T with Judicial Processes</a></li>
            <li><a href="/index.php/about-us/glorious-past/sugar-technology-mission">Sugar Technology Mission</a></li>
            <li><a href="/index.php/about-us/glorious-past/fly-ash-utilization-programme">Fly Ash Utilization Programme</a></li>
            <li><a href="/index.php/about-us/glorious-past/technopreneur-promotion-programme-tepp">Technopreneur Promotion Programme (TEPP)</a></li>
            <li><a href="/index.php/about-us/glorious-past/umbrella-scheme-on-technology-vision-2020">Umbrella Scheme on Technology Vision 2020</a></li>
            <li><a href="/index.php/about-us/glorious-past/national-innovation-project">National Innovation Project</a></li>


    </ul>
  </li>

  <li><a href="/index.php/about-us/rti">RTI</a></li>
  <li><a href="/index.php/about-us/vigilance">Vigilance</a></li>
  <li><a href="/index.php/about-us/grievance-redressal">Grievance Redressal</a></li>
  <li><a href="/index.php/about-us/rajbhasha">Rajbhasha</a></li>
  <li><a href="/index.php/about-us/transparency">Transparency</a></li>

    </ul>

The submenu for Technology Vision 2020 is not showing up. ANy pointers any one? Thanks

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