def get_relationships_by_search(self, relationship_query=None, relationship_search=None):
pass<EOL>
Gets the search results matching the given search query using the given search.

        arg:    relationship_query
                (osid.relationship.RelationshipQuery): the relationship
                query
        arg:    relationship_search
                (osid.relationship.RelationshipSearch): the relationship
                search
        return: (osid.relationship.RelationshipSearchResults) - the
                returned search results
        raise:  NullArgument - ``relationship_query`` or
                ``relationship_search`` is ``null``
        raise:  OperationFailed - unable to complete request
        raise:  PermissionDenied - authorization failure
        raise:  Unsupported - ``relationship_query`` or
                ``relationship_search`` is not of this service
        *compliance: mandatory -- This method must be implemented.*