I don't understand why people are still searching ITAMatrix for Vietnam POS. ITAMatrix shows tons of phantom availability-- just look at the whole month of December for instance. CX website shows the exact availability if you make a dummy booking for a new ticket. The only very slight inaccuracies with CX website are AA connections, because the website times out searching 7 days worth of departures and 7 days worth of arrivals. However the lowest A price, if displayed, is really there in a connection, which the website duly fetches when refined to exact dates.