I usually do not wish to search all OTN and instead limit my search results to several forums, such as "Oracle Linux" and "Generic Linux".
Unfortunately, the search page https://community.oracle.com/search.jspa?customTheme=otn only takes 1 forum name in the "Restrict results by" field and it does not work when specifying a parent forum that include sub-spaces. So at the moment I will have to perform separate searches in each forum space.
I think it would be more convenient and a good idea if the "Restrict by" field would accept several forum spaces, or work with forum spaces including sub-forums. I think it would also be nice if such search restrictions could be saved in a template for the next use.