Perhaps you should try some spelling variations:
"trinh chat cac snippets" » "tinh chat cac snippets", "trinh luat cac snippets", "trinh han cac snippets", "trinh chat cam snippets", "trinh chat cao snippets", "trinh cho cac snippets"
"dung cho cong snippets" » "dung cao cong snippets", "dung cua cong snippets", "dung cac cong snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh chat cac snippets") or ("dung cho cong snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh chat cac snippets") OR ("dung cho cong snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh chat cac snippets ) or ( dung cho cong snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh chat cac snippets") or ("dung cho cong snippets"))) or ("locating bug code snippets"))*.