redbled
You can limit the search to the specific blog. You can either click on the blog-name left of the date of posting, or go to the uploaders profile to see all blogs run by the uploader. Then choose a blog on the list.
I don't think it's possible to search for edited posts. The post is still listed at the original date of posting, but the date gets the additonal information that the post is edited.
An additional search function needs to be added to find latest edited posts.
Another solution could be that edited posts gets listed by the date of latest editing instead of the date of the original post.