Perhaps you should try some spelling variations:
"dung san toc snippets" » "dong san toc snippets", "dung sai toc snippets", "dung luan toc snippets", "dung dan toc snippets", "dung sang tac snippets", "dung san thuc snippets"
"dung vbugss code snippets" » "dung vbugss core snippets", "dung vbungss code snippets", "dung vbugsss code snippets"
"locating bug code snippets" » "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 vbugss code snippets") or ("dung san toc snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vbugss code snippets") OR ("dung san toc snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung vbugss code snippets ) or ( dung san toc snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung vbugss code snippets") or ("dung san toc snippets"))) or ("locating bug code snippets"))*.