@RsH - there is no point in comparing what you get from a search by book and author with a search on their website by author. They are completely different things. If you want to compare like with like, then use the "FictionDB for Author" rather than the "FictionDB for Book" link.
I think we have established that the FictionDB search engine is pretty average. I am satisfied that the plugin is passing the best it can to the website now.