How do modify the full search function in nopCommerce

1.Go to the Nop.Web/Controllers/CatalogController. find the search action and set the searchinDescriptions to be true

IPagedList<Product> products = new PagedList<Product>(new List<Product>(), 0, 1);
           // only search if query string search keyword is set (used to avoid searching or displaying search term min length error message on /search page load)
           if (Request.Params["Q"] != null)
           {
               if (model.Q.Length < _catalogSettings.ProductSearchTermMinimumLength)
               {
                   model.Warning = string.Format(_localizationService.GetResource("Search.SearchTermMinimumLengthIsNCharacters"), _catalogSettings.ProductSearchTermMinimumLength);
               }
               else
               {
                   var categoryIds = new List<int>();
                   int manufacturerId = 0;
                   decimal? minPriceConverted = null;
                   decimal? maxPriceConverted = null;
                   bool searchInDescriptions = true;
                   if (model.As)
                   {
                       //advanced search
                       var categoryId = model.Cid;
                       if (categoryId > 0)
                       {
                           categoryIds.Add(categoryId);
                           if (model.Isc)
                           {
                               //include subcategories
                               categoryIds.AddRange(GetChildCategoryIds(categoryId));
                           }
                       }