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 san code snippets" » "dong san code snippets", "dung sai code snippets", "dung luan code snippets", "dung san co snippets", "dung san cong snippets", "dung san 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 cac code snippets") or ("dung san code 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 san code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cac code snippets") or ("dung san code snippets"))) or ("locating bug code snippets"))*.