Perhaps you should try some spelling variations:
"trinh luan trac snippets" » "trinh luat trac snippets", "trinh quan trac snippets", "trinh han trac snippets", "trinh luan tac snippets", "trinh luan tranh snippets", "trinh luan thuc snippets", "trinh luan trac 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 luan trac 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 luan trac snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh luan trac snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.