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