Perhaps you should try some spelling variations:
"dung vonng code snippets" » "dung cong code snippets", "dung von code snippets", "dung dong code snippets", "dung vonng code slippers", "dung vonng core snippets"
"dung co trinh snippets" » "dung co tranh snippets", "dung cong trinh snippets", "dung tao trinh snippets", "dung cho trinh snippets", "dung cua trinh snippets", "dung co trinh slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bug core 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 co trinh snippets") or ("dung vonng code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung co trinh snippets") OR ("dung vonng code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung co trinh snippets ) or ( dung vonng code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung co trinh snippets") or ("dung vonng code snippets"))) or ("locating bug code snippets"))*.