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