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

        :param grade_system_query: the grade system query
        :type grade_system_query: ``osid.grading.GradeSystemQuery``
        :param grade_system_search: the grade system search
        :type grade_system_search: ``osid.grading.GradeSystemSearch``
        :return: the grade system search results
        :rtype: ``osid.grading.GradeSystemSearchResults``
        :raise: ``NullArgument`` -- ``grade_system_query`` or ``grade_system_search`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure
        :raise: ``Unsupported`` -- ``grade_system_query`` or ``grade_system_search`` is not of this service

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