Perhaps you should try some spelling variations:
"trinh cau code snippets" » "trinh chat code snippets", "trinh chao code snippets", "trinh tu code snippets", "trinh cau cong snippets", "trinh cau de snippets", "trinh cfd code snippets", "trinh cau code slippers"
"dung vung va snippets" » "dung ung va snippets", "dung dung va snippets", "dung hung va snippets", "dung luong va snippets", "dung duong va snippets", "dung vung va 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 cau code snippets") or ("dung vung va snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cau code snippets") OR ("dung vung va snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cau code snippets ) or ( dung vung va snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cau code snippets") or ("dung vung va snippets"))) or ("locating bug code snippets"))*.