Perhaps you should try some spelling variations:
"trinh viet code snippets" » "ninh viet code snippets", "trinh vat code snippets", "trinh viet co snippets", "trinh viet some snippets", "trinh viet code slippers"
"dung luat data snippets" » "dung luan data snippets", "dung quat data snippets", "dung cua data snippets", "dung luat dat snippets", "dung luat dan snippets", "dung luat dau snippets", "dung luat data 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 viet code snippets") or ("dung luat data snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh viet code snippets") OR ("dung luat data snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh viet code snippets ) or ( dung luat data snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh viet code snippets") or ("dung luat data snippets"))) or ("locating bug code snippets"))*.