Don't ever cut roots. Vandas in poor health need all the roots they have. Roots will branch when conditions improve.
You've had both cold weather and hot/dry weather this winter, I think. Both are hard on Vandas. Nights under 50 F / 10C can stun them for months. Many will die in the low 40s / 4-6C. Vandas prefer warm weather and high humidity.
Don't let them get so cold in the future. Water every day. Go to the Motes Orchids Web site and sign up for the E-mail newsletter. They send out a message each month telling what to do that month with your plants.
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