In Columbia, you've got two options within a few minutes of the Rt 32 exit, Pho Dat Thanh and An Loi. Between the two, I prefer Dat Thanh, but it's been a while since I've been to either.
7104 Minstrel Way Ste 9, Columbia, MD 21045
Pho Dat Thanh
9400 Snowden River Pkwy Ste 125, Columbia, MD 21045