Perhaps you should try some spelling variations:
"dung thang dat snippets" » "hung thang dat snippets", "cung thang dat snippets", "dung thuong dat snippets", "dung thanh dat snippets", "dung hang dau snippets", "dung thang tam snippets", "dung thang dat 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 thang dat 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 thang dat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung vbugs code snippets ) or ( dung thang dat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung vbugs code snippets") or ("dung thang dat snippets"))) or ("locating bug code snippets"))*.