Perhaps you should try some spelling variations:
"The emperor's voice in .NET" » "The emperor's forces in .NET", "The emperor's life in .NET", "The emperor's justice in .NET"
"The expert's voice in .NET" » "The experts voices in .NET", "The expert voices in .NET", "The expert's point in .NET"
"the expert's guide in .net" » "the expert guide in .net"

Try widening your search to All Fields.

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