Perhaps you should try some spelling variations:
"trinh dan luan snippets" » "trinh han luan snippets", "trinh van luan snippets", "trinh san luan snippets", "trinh doanh luan snippets", "trinh dung luan snippets", "trinh tang luan snippets", "trinh dan 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: (((("trinh dan luan snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh dan luan snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh dan luan snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.