diff --git a/app/controllers/admin/surveys_controller.rb b/app/controllers/admin/surveys_controller.rb
index 06c3e03..a2281ba 100644
--- a/app/controllers/admin/surveys_controller.rb
+++ b/app/controllers/admin/surveys_controller.rb
@@ -29,9 +29,13 @@ class Admin::SurveysController < OrbitAdminController
     if can_edit_or_delete?(@survey)
       @table_fields = ['survey.taken_by', 'survey.taken_date',"survey.records"]
       @survey_answer_groups = @survey.survey_answer_groups.desc(:last_modified).page(params[:page]).per(15)
-      if params[:search]
-        match_user_ids = User.where(:id.in=>@survey.survey_answer_groups.pluck(:user),:member_name=>/#{params[:search]}/).pluck(:id) rescue [];
-        @survey_answer_groups = @survey_answer_groups.where(:user.in=>match_user_ids)
+      if params[:search].present?
+        if params[:search] == "NA"
+          @survey_answer_groups = @survey_answer_groups.where(:user=>nil)
+        else
+          match_user_ids = User.where(:id.in=>@survey.survey_answer_groups.pluck(:user),:member_name=>/#{params[:search]}/).pluck(:id) rescue [];
+          @survey_answer_groups = @survey_answer_groups.where(:user.in=>match_user_ids)
+        end
       end
       @answer_repeat = @survey.get_answer_repeat
     else