Yahoo Answers API - questionSearch - Filter out certain words

Is the Yahoo Answers API very limited on its functionality, or the documentation is incomplete?

Here is API ref: http://developer.yahoo.com/answers/V1/questionSearch.html

I'd need to be able to retrieve questions that contain termA or termB but neither termC or termD.

Example URL for questions containing termA: http://answers.yahooapis.com/AnswersService/V1/questionSearch?appid=YahooDemo&query=termA

Also, further information on the API will be helpful.

Thanks!

Some Googling showed that the query supports AND, OR, ANDNOT and brackets. So for a query that returns anything on cats but nothing on dogs:

http://answers.yahooapis.com/AnswersService/V1/questionSearch?appid=YahooDemo&query=cats+ANDNOT+dogs

As for the brackets, to query for anything that mentions cats or dogs but not fish:

http://answers.yahooapis.com/AnswersService/V1/questionSearch?appid=YahooDemo&query=(cats+dogs)+ANDNOT+fish