public IActionResult AdvancedSearch(
			int pageNumber, 
			string isbn, string author, 
			string publisher, string title
		)
		{
			try
			{
				ServiceResponse<FoundBooks> response = googleBooks.FoundBooksAdvanced(
					pageNumber, 
					isbn, author, 
					publisher, title
				);

				if (response.HasIssues)
					return response.ShowIssues();
				
				if (response.ApiResponse.items is null)
					return NoContent();
				
				return Ok(response.ApiResponse);
			}
			catch (Exception e)
			{
				return StatusCode(StatusCodes.Status500InternalServerError, e.Message);
			}
		}