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 qua dat snippets" » "duong qua dat snippets", "dung quan dat snippets", "dung cua dat snippets", "dung quy dat snippets", "dung qua da snippets", "dung qua dan snippets", "dung qua dat 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 qua dat 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 qua dat snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cac code snippets") or ("dung qua dat snippets"))) or ("locating bug code snippets"))*.