Problem description
It is not likely that raw HL7 messages will be directly exposed to Google in the form of web pages as showing them does not make much sense for web users.
So in order to find your HL7 message samples you will have to dive little bit deeper underneath what web search tools show you...
How to solve it
You should be able to find some message samples bundled with tools that work with them.
The tool developers needed some samples for testing their tools.
If the tool is open source, you should be able to find the message samples in the source code repository or get some samples by asking members of the development community.
In case of closed source tools it is likely that you will find some "demo" messages after installing the tool.
Some solutions to get you started
Some tools that I find very useful that (may)contain HL7 message samples
- (yes) Inner Harbour Software's HL7Spy - http://hl7spy.ca/
- (maybe) Jeremy Reagan's Hl7 Analyst - https://hl7analyst.codeplex.com/
- (maybe) Mike Litherland's HL7 UTILITIES - http://nule.org/wp/?page_id=55
- (maybe) University Health Network's HAPI TestPanel - http://hl7api.sourceforge.net/
- ...
