@abc.abstractmethod<EOL><INDENT>def get_books_by_search(self, book_query, book_search):<DEDENT>
return<EOL>
Gets the search results matching the given search.

        :param book_query: the book query
        :type book_query: ``osid.commenting.BookQuery``
        :param book_search: the book search
        :type book_search: ``osid.commenting.BookSearch``
        :return: the search results
        :rtype: ``osid.commenting.BookSearchResults``
        :raise: ``NullArgument`` -- ``book_query`` or ``book_search`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``book_query`` or ``book_search`` is not of this service

        *compliance: mandatory -- This method must be implemented.*