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 expert's voice in .net" » "the experts voices in .net", "the emperor's voice in .net", "the expert's 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 experts sources in .NET")).
• Removing quotes may allow a broader search: (( the expert's voice in .net ) or ( The experts sources in .NET )).
• Adding a wildcard symbol may retrieve word variants: (("the expert's voice in .net") or ("The experts sources in .NET"))*.