I have a running joke with friends that I take to Lang Van and that is you can order anything you want off of their 200 item menu but chances are the manager won't let you have it. Sure enough friends of mine will carefully look over the menu say what they want then the manager will shake her head and say "no, no" "what do you like? Shrimp, rice? I make you something"
If you are smart you'll go with her suggestion because the food is good! I get the same thing every time: Chicken with flat noodles (might be #105 or 106 on the menu) and vegetables + shrimp spring rolls. [sidenote* the manager always remembers me and what I ordered even if it was months ago.]
The only bad thing about Lang Van is the location (far away from most and not the safest) but the food will keep you coming back.