Perhaps you should try some spelling variations:
"dung vbung code snippets" » "dung vung code snippets", "dung trung code snippets", "dung chung code snippets", "dung vbung code slippers"
"dung tran tu snippets" » "dung tren tu snippets", "hung tran tu snippets", "dang tran tu snippets", "dung tran tuan snippets", "dung tran thuy snippets", "dung tran thi snippets", "dung tran tu slippers"
"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 vbung code snippets") or ("dung tran tu snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("dung vbung code snippets") or ("dung tran tu snippets"))) or ("locating bug code snippets"))*.