Perhaps you should try some spelling variations:
"dung tren duc snippets" » "dung trong duc snippets", "dung trung duc snippets", "dung tran duc snippets", "dung ren duc snippets", "dung tien duc snippets", "dung tren duc slippers"
"dung vbugss code snippets" » "dung vbugss code slippers", "dung vbugss core snippets", "dung vbungss code snippets", "dung vbugsss code snippets"
"locating bug code snippets" » "locating bug code slippers", "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 tren duc snippets") or ("dung vbugss code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tren duc snippets") OR ("dung vbugss code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung tren duc snippets") or ("dung vbugss code snippets"))) or ("locating bug code snippets"))*.