I have a couple of orchids in a row and they all get the same amount of light and water.

There is this 1 orchid that has been producing leaves but no bloom for 2 years. I cut the stem back 2 years ago, when it didn't produce any more flowers. How can I get it to grow?
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The other orchid next to is blooming and on the stem, a round leaf started to grow about 1 year ago and then stopped. It is blooming regularly but the leaf on the stem hasn't grown. Is this bad, should I do anything about it?

The third is a different variety. It hasn't changed. It started to go a little brown in the winter and then with a little less watering and more light, it stopped turning brown. It hasn't changed. How can I get this growing/blooming?
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