Multiple File Types in Search Results

I have read the help on using multiple files name\types in the search tool. I have tried several combinations with no success. I need to make a list of .nc and .txt files. I have tried the following combinations in the Name field.

.nc, .txt

*.nc, *.txt

.nc, *.txt

*.nc, .txt

with or without the asterisk use just a single file type brings up the results I want for each file type. Now I need to combine them.

Any ideas on what I'm doing wrong?

Ver 2014 SP5

SolidworksSolidworks Pdm enterprise Pdm