Perhaps you should try some spelling variations:
"trinh cac code snippets" » "trinh cau code snippets", "trinh chat code snippets", "trinh chao code snippets", "trinh cac cong snippets", "trinh cac co snippets", "trinh cac che snippets", "trinh cac code slippers"
"dung co thi snippets" » "dung cho thi snippets", "dung cong thi snippets", "dung cua thi snippets", "dung cao thi snippets", "dung co thai snippets", "dung do thi snippets", "dung co thi 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 cac code snippets") or ("dung co thi snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cac code snippets") OR ("dung co thi snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cac code snippets ) or ( dung co thi snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cac code snippets") or ("dung co thi snippets"))) or ("locating bug code snippets"))*.