Victor,
I think most (if not all) FTA Vietnamese channels are on C-Band these days, which requires a dish of 2.3m or bigger.
Someone please correct me if there are any FTA Vietnamese channels available in Australia.
You may find some Vietnamese channels listed on Lyngsat that are on Ku Band (which is what you existing dish is suited to) but the beams may not be focused on Australia.
Many satellite signals are now encoded in DVB-S2 MPEG4, which your old receiver may not be compatible with.
There are Vietnamese channels on Vinasat1 and Thaicom5 which are both C-Band.
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