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

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 SQL server") OR ("The expert's guide in SQL server"))) OR ("the emperor's voice in sql server")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"The expert's voice in SQL server\") OR (\"The expert's guide in SQL server\"))) or (\"the emperor's voice in sql server\"))".
• Removing quotes may allow a broader search: (((( The expert's voice in SQL server ) OR ( The expert's guide in SQL server ))) or ( the emperor's voice in sql server )).
• Adding a wildcard symbol may retrieve word variants: (((("The expert's voice in SQL server") OR ("The expert's guide in SQL server"))) or ("the emperor's voice in sql server"))*.