I did'nt realise there is a ssp of D. ravindra which is also similar.
Firstly D. theda is out as the HW postdiscal spot 6(hollow) & spot 7 (solid) are well out of line.
The lower postdiscal bands are also long. https://yutaka.it-n.jp/lyc4g/83100010.html
In D. rufotaenia vietnamica.
1. HW postdiscal spots 6 & 7are slightly out of line, with spot 7 shifted inwards.
2. The rest of the postdiscal spots are less curvy.
3. FW discal band is more or less straight.
This individual matches the female from Dong Nai well. https://yutaka.it-n.jp/lyc4g/83090020.html
appears that whether the bands are ssolid or 'hollow' depends on the subspecies in most species.