Perhaps you should try some spelling variations:
"dung von trong snippets" » "dung ion trong snippets", "dung hon trong snippets", "dung ton trong snippets", "dong von trong snippets", "dung cong trong snippets", "dung va trong snippets", "dung von trong slippers"
"dung vbugs code snippets" » "dung vbugs code slippers", "dung vbungs code snippets", "dung vbugss 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 vbugs code snippets") or ("dung von trong snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vbugs code snippets") OR ("dung von trong snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung vbugs code snippets") or ("dung von trong snippets"))) or ("locating bug code snippets"))*.