Perhaps you should try some spelling variations:
"dung dung cong snippets" » "duong dung cong snippets", "ung dung cong snippets", "dung ung cong snippets", "dung dung trong snippets", "dung dung vong snippets", "dung dung cog snippets", "dung dung dongg snippets"
"dung con code snippets" » "dung von code snippets", "dung co code snippets", "dung dong code snippets", "dung cfd code snippets", "dung con co snippets", "dung con coi snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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