Phrase searching can be done by adding quote marks to the phrase.
For example "trainz service packs"
The + sign should work, but it may need to be directly in front of the word.
For example Trainz +2009
Similar with - (this is used to exclude words)
For example Trainz -2004
These can be used in various combinations.
For example Trainz +2009 -sp4 +"updating assets"
Shane