It was pointed out to me the other day that nearly all the Vectorworks manuals are available at the Amazon online bookstore.
I normally recommend supporting you local distributor or reseller, and I still do. If they have the Vectorworks manuals, then pay a little extra and support the local guy, so that they are there when you need them for support.
If you are trying to find good Vectorworks manuals and the local distributor is not keeping the manuals in stock, that can create a long delay for you, while they order the manuals and get them shipped to you. The local distributor in each country should be keeping the manuals in stock. So, if they are making it hard for you to buy the Vectorworks manuals, you have another solution, get them from amazon.com.