Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung cu noi snippets" » "dung cua noi snippets", "dung co noi snippets", "dung cho noi snippets", "dung cau noi snippets", "dung cuu noi snippets", "dung nu noi snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung cu noi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cu noi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cu noi snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cu noi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.