public async Task <IEnumerable <Book> > SearchBooks(SearchDto search)
{
var title = _queryHelper.Encode(search.Title);
var author = _queryHelper.Encode(search.Author);
var orderBy = _queryHelper.GetOrderBy(search.OrderBy);
var url = _queryHelper.GetUrl(title, author, orderBy, search.MaxResults);
var results = await _searchRunner.PerformSearch(url);
return(_searchMapper.MapBooks(results));
}