Why would you do that? Nobody wants to get actual results
from searching. That would make searching pointless, with, you know, actually getting something out of it.
EDIT: Oh, getting results from Google. Unnecessary.
1. Searching for topics containing the word "Marine" in the category "Other".
2. Now I get 13 pages of topics containing the word "Marine".
3. Lets say I now want to know wich of those topics contain the word "Machine" (just something that came up in my head writing this post
4. As it is now I cannot search the results of the last search, and that is what I'm suggesting you should be able to do. In other words, search the search results.