I was saying that if you change forumchoice[]=35 to include=35 it will work.
Edit: oops, forget that last part I wrote, I got myself confused by not refreshing my browser page. But looking at the search code, it seems like it might have something to do with how the content type is specified.
Edit again: OK, I'm pretty sure that this works:
Code:
<a href="search.php?do=finduser&userid={vb:raw post.userid}&contenttypeid=1&showposts=0&forumchoice[]=22">test</a>