...
$filter = new Filter(DATARECORD CLASS NAME);
$form = new Form('searchform', 'search.form');
if ($form->isSubmitted()) {
  $values = $form->getValues();
  $filter->addCondition(new ConditionLike('field_to_search', $values['value_to_find']));
}
$collection = $filter->execute();

$result = Table::getDataFromCollection($collection);