Multiple words may be searched for (up to 50).
For two (or more) words separated by a space, the search will find articles
that include either (or any) of the words.
For two (or more) words joined by a plus sign (+), the search will only
find articles that include both (or all) of the words.
To view the results you will need
to have Adobe Acrobat installed on your computer. This can be acquired