I recommend to look at a new research tools Answer Analyst.
You will find a fine video that will enables you to understand the main features of the tool.
The tool’s price is $77.
An info about tool is rather short and I did not find answers to such questions:
1. What approach or technology do they use when processing your query – natural language question?
2. What search engine do they use?
But in any case it is an interesting tool and you should spend about 10 minutes to watch their video.