When searching Westlaw International, particularly news searches, you might want to look at using a couple of search operators to help refine your searching technique:
% = not
# = turning off plurals and equivalents
For example, if you want to search for ATM and Commonwealth Bank but not NAB you might want to run the search as:
#atm & commbank “commonwealth bank” % nab “national australia bank”
Remember a space equals OR in Westlaw International!