Perhaps you should try some spelling variations:
"dung trinh luan snippets" » "dung tinh luan snippets", "dong trinh luan snippets", "cong trinh luan snippets", "dung trinh luat snippets", "dung trinh quan snippets", "dung trinh han snippets", "dung trinh luan slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung code 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 dung code snippets") or ("dung trinh luan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dung code snippets") OR ("dung trinh luan snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung dung code snippets") or ("dung trinh luan snippets"))) or ("locating bug code snippets"))*.