Perhaps you should try some spelling variations:
"The experts sources in .NET" » "The expert sources in .NET", "The expertise sources in .NET", "The experts resources in .NET"
"The experts voices in .NET" » "The expert voices in .NET", "The experts view in .NET", "The experts views in .NET"
"the expert's guide in .net" » "the expert guide 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 experts voices in .NET") OR ("The experts sources in .NET"))) OR ("the expert's guide in .net")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"The experts voices in .NET\") OR (\"The experts sources in .NET\"))) or (\"the expert's guide in .net\"))".
• Removing quotes may allow a broader search: (((( The experts voices in .NET ) OR ( The experts sources in .NET ))) or ( the expert's guide in .net )).
• Adding a wildcard symbol may retrieve word variants: (((("The experts voices in .NET") OR ("The experts sources in .NET"))) or ("the expert's guide in .net"))*.