Perhaps you should try some spelling variations:
"The expert sources in .NET" » "The egret sources in .NET", "The report sources in .NET", "The exposure sources in .NET"
"the expert's guide in .net" » "the expert guide in .net"
"The expert voices in .NET" » "The experts voices in .NET", "The expert view in .NET", "The expert views in .NET"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("The expert voices in .NET") OR ("The expert sources in .NET"))) OR ("the expert's guide in .net")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"The expert voices in .NET\") OR (\"The expert sources in .NET\"))) or (\"the expert's guide in .net\"))".
• Removing quotes may allow a broader search: (((( The expert voices in .NET ) OR ( The expert sources in .NET ))) or ( the expert's guide in .net )).
• Adding a wildcard symbol may retrieve word variants: (((("The expert voices in .NET") OR ("The expert sources in .NET"))) or ("the expert's guide in .net"))*.