Vanda likes
A sunny spot
Vanda worships the sun. Make sure you give her as much as possible, even if it means on the windowsill - she'll be fine if hit by a bit of wind.
Well drained soil
Vanda really doesn't like her soil too moist, so make sure that the soil she's planted in drains well.
Pruning
Once her flowers begin to fade, cut her back to about 10-20cm above the soil.