You do not write what you experienced as different...
However, let me guess: wildcards?
The " + " is in 3.0 a boolean operator - see the help file (GREAT!).
For using a wildcard in a search term representing 0 or more characters you need to use an * in stead of the +. And the more: you can search on more than one term.
But again I suggest: read the help. When the search dialog is showed, push F1 and read.