Are you trying to book on points as a DVC member, or for a cash reservation through Disney? If you're a DVC member, do you own at VWL , or at another resort? What time period are you trying to book?
If you're not a DVC member, the primary way a VWL villa becomes available to the general public is if a VWL owner trades out for a non-DVC property, and DVC 'sells' a villa to Disney to pay for the exchange. So at any given time, the pool of available villas is pretty small. Villas can also become available as it gets closer to your dates; DVC also makes unused villas available to the public. Again, this is not a large number of villas; VWL is a very small, very popular resort.
Let us know when and how you're trying to book, and we'll provide whatever advice we can.