Chose the exposed filter from a list of dropdown exposed filter and search within that selected filter with the search term entered in the same textfield. https://www.dropbox.com/s/jgenr05lo8r3173/Voila_Capture%202014-08-01_11-01-15_pm.png 1) Create a view with title and body field. 2) Create two filter with title and body with operator 'Contain…

combine exposed filter.php

<?php
 /**
 * Implements hook_FORM_ID_alter().
 */
 function custom_form_views_exposed_form_alter(&$form, &$form_state, $form_id){
  if ($form_id == 'views_exposed_form' && $form_state['view']->name == 'VIEWS_NAME') {
    // Unset the title and body filter info so that it doesn't print any label.
    unset($form['#info']['filter-title']);
    unset($form['#info']['filter-body_value']);
    // Set the #printed = TRUE on title and body render element to escape them from being print.
    $form['title']['#printed'] = TRUE;
    $form['body_value']['#printed'] = TRUE;

    $form_element = array();
    $options = array(
      // '' => '-Select-',
      'title' => 'Title',
      'body' => 'Body',
    );
    $form_element['search_within'] = array(
      '#type' => 'select',
      '#title' => t('Search within'),
      '#options' => $options,
      '#default_value' => !empty($form_state['search_within']) ? $form_state['search_within'] : '',
      '#description' => t('Set the <em>Title</em> or <em>Body</em> within which you want to search.'),
      '#prefix' => '<div class="views-exposed-widget">',
      '#suffix' => '</div>',
    );
    $form_element['search_box'] = array(
      '#type' => 'textfield',
      '#title' => t('Search term'),
      '#default_value' => !empty($form_state['search_box']) ? $form_state['search_box'] : '',
      '#description' => t('Enter the term which you want to search.'),
      '#prefix' => '<div class="views-exposed-widget">',
      '#suffix' => '</div>',
    );
    $form = $form_element + $form;
  }
}
/**
 * Implements hook_views_query_alter().
 */
function custom_views_query_alter(&$view, &$query) {
    if ($view->name == 'VIEWS_NAME') {
    if (!empty($view->exposed_input['search_box']) && $view->exposed_input['search_within'] == 'title') {
      // Add title filter condition if title is selected
      $query->where[1]['conditions'][] = array(
        'field' => 'node.title',
        'value' => '%' . $view->exposed_input['search_box'] . '%',
        'operator' => 'LIKE',
      );
    }
    if (!empty($view->exposed_input['search_box']) && $view->exposed_input['search_within'] == 'body') {
      // Create join with fiedl_data_body table.
      // source:
      // https://api.drupal.org/api/views/includes!handlers.inc/function/views_join%3a%3aconstruct/
      // https://www.drupal.org/node/2049051#comment-7784967
      $join = new views_join;
      $extra = array();
      $extra[] = array(
        'table' => 'field_data_body',
        'field' => 'entity_type',
        'value' => 'node',
        'operator' => '=',
      );
      $extra[] = array(
        'table' => 'field_data_body',
        'field' => 'deleted',
        'value' => '0',
        'operator' => '=',
      );
      $join->construct('field_data_body', 'node', 'nid', 'entity_id', $extra);
      // Add join to query; 'node' is the left table name
      $view->query->add_relationship('field_data_body',$join,'node');
      // Add fields from table (or where clause, or whatever)
      $view->query->add_field('field_data_body','entity_id');
      // Add body filter condition if body is selected
      $query->where[1]['conditions'][] = array(
        'field' => 'field_data_body.body_value',
        'value' => '%' . $view->exposed_input['search_box'] . '%',
        'operator' => 'LIKE',
      );
    }
  }
}