The most common reasons an orchid will not bloom are:
- Insufficient light
- Insufficient nutrition
- Too much nitrogen
With many phals, there is also the requirement that they see a 10- to 14 day period with average temperatures below about 65°F, in order to initiate spikes.
Then again, maybe the biggest problem is impatience.
However, as Brooke pointed out, you have not told us what kinds of orchids you're talking about, and without that, none of our suggestions may have much value.