RTFM multiple search terms

Hi. I’ve recently installed RTFM 2.2rc2 in RT 3.6. On ticket replies,
it is possible to search RTFM for entries based on a string. I have
been unable to search on multiple terms. I’ve checked all the
documentation and as of yet I don’t understand the syntax for searching
multiple strings contained in the RTFM entry. In other words, a search
for ‘foo’ returns entries containing ‘foo’, but a search for ‘foo bar’,
only returns entries containing exactly ‘foo bar’, but not 'foo OR bar’
or ‘foo AND bar’. Am I missing something or is RTFM lacking this
functionality that I am expecting?

Thanks.

David Smithson