The following is a summary of a VOSON user's question (asked via support email), with a response below.
Question: I've crawled a site but realised that I didn't set the crawler to go deep enough (the VOSON crawler didn't reach a particular page where I know there are links to other sites).  Is it possible for me to recrawl the site?
Answer: At present, the only way you can recrawl a site is to create a new voson database and make sure you change the default webminer parameters.  You may need to experiment to ensure that the crawler reaches the depth of the site that you want.