Did you actually try to book it?

I recently booked flights from ICN to SIN via HKG, and KUL-ONT via SIN using combinations of OZ, SQ and UA. The flight combinations would show up, but then they wouldn't price. Or, if it would price, they then suddenly "sold out" when I tried to purchase. Or sometimes it would do neither, suggesting that I try again with larger cities (gotta love that one, cities larger than Tokyo, Hong Kong, Singapore )

Anyone, after several tries, I finally got the tickets priced and booked. So keep trying if its a good deal.