Perhaps you should try some spelling variations:
"trinh cua ngu snippets" » "tinh cua ngu snippets", "trinh luat ngu snippets", "trinh quan ngu snippets", "trinh cuu ngu snippets", "trinh cua ndu snippets", "trinh cua nguoi snippets", "trinh cua ngu 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 cua ngu 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 cua ngu snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cua ngu snippets ) or ( dung dung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cua ngu snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.