Given that airtight containers are not sufficient a barrier, the Vashta Nerada could be able to overcome a Dalek's metal shell. read more
Also, the daleks are a race of highly intelligent creatures, technologically more superior (when compared to the Vashta Nerada). They have survived for longer, fought more powerful enemies (the Time-Lords), in short have been more successful as a species. read more
The Time War Daleks don't have to do anything at all. The Vashta Nerada would be incinerated the moment they touched their shields. The other Daleks can just ignore them. Unless the Vashta Nerada have a second appearance I'm not aware of, nothing indicates they can penetrate Dalek armor. read more