Don't miss the some of the options in the Find tool for MS Word - which haven't always been there.
To the lower right, you'll find options to match prefixes and suffixes. So if you check the former, and enter 'core' in the 'Find what' box, if will find the words, 'corepower' and 'Corey', but not 'hardcore'.
The options for 'Ignore punctuation characters' and 'Ignore white-space characters' will allow you to find a phrase such as, "Now is the time. For all good men.", when searching for, "Now is the time for all good men".