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"

Try widening your search to All Fields.

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"))*.