I've discovered that if you can't do an exact word search for a string that includes a stop word.
For example, if you search for:
"africa and afghanistan"
(with the quotes in the search) where a page contains that exact phrase, you will not find it. (You can search for the same phrase without the quotes, and it will be found, along with pages that only contain one of the words.)
I assume this is because "and" is a stop word, and thus is not indexed.
I haven't found any way to do this kind of search – searching
"africa afghanistan"
also doesn't work.
Is this expected behavior? Is there a work around?