Perhaps you should try some spelling variations:
"dung trong code snippets" » "dung trong cong snippets", "dung trong co snippets", "dung trong che snippets", "dung trong code slippers"
"hoang van code snippets" » "hang va code snippets", "hoang van de snippets", "hoang van hoe snippets", "hoang van cong snippets", "hoang van code slippers"
"locating bug code snippets" » "locating bug code slippers", "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 trong code snippets") or ("hoang van code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung trong code snippets") OR ("hoang van code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung trong code snippets ) or ( hoang van code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung trong code snippets") or ("hoang van code snippets"))) or ("locating bug code snippets"))*.