You still didn't update your form element name. You have:
<input type="text" name="Search" class="form-control mr-sm-2" placeholder="Search" aria-label="Search">
<span class="buttonFieldGroup" >
<input type="submit" value="Search" class="formButton unstyled" id="Search" name="Search" />
</span>
it should be:
<input type="text" name="Keyword" class="form-control mr-sm-2" placeholder="Search" aria-label="Search">
<span class="buttonFieldGroup" >
<input type="submit" value="Search" class="formButton unstyled" id="Search" name="Search" />
</span>
You also didn't bind the keyword search in your Database Search server behavior to a form value.
Update the keyword search and click the lightning bolt to select the newly renamed "Keyword" field to search against.