In the past , when there was no writing , the Lhobas kept track of history through telling their descendants and tying knot codes about their past .
Few Lhoba know the Tibetan language .
In the past , when there was no writing , the Lhoba kept track of history through telling Lhoba 's descendants and tying knot codes about their past .
Few Lhoba know the Tibetan language .