Perhaps you should try some spelling variations:
"The expert sources in .NET" » "The egret sources in .NET", "The exposure sources in .NET"
"The report sources in .NET" » "The support sources in .NET", "The report series in .NET", "The report studies in .NET"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"The expert sources in .NET\") OR (\"The report sources in .NET\"))".
• Removing quotes may allow a broader search: (( The expert sources in .NET ) OR ( The report sources in .NET )).
• Adding a wildcard symbol may retrieve word variants: (("The expert sources in .NET") OR ("The report sources in .NET"))*.