@abc.abstractmethod<EOL><INDENT>def get_items_by_search(self, item_query, item_search):<DEDENT>
return<EOL>
Gets the search results matching the given search query using the given search.

        :param item_query: the item query
        :type item_query: ``osid.assessment.ItemQuery``
        :param item_search: the item search
        :type item_search: ``osid.assessment.ItemSearch``
        :return: the returned search results
        :rtype: ``osid.assessment.ItemSearchResults``
        :raise: ``NullArgument`` -- ``item_query`` or ``item_search`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure occurred
        :raise: ``Unsupported`` -- ``item_search`` or ``item_query`` is not of this service

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