Perhaps you should try some spelling variations:
"trinh cua dac snippets" » "tinh cua dac snippets", "trinh luat dac snippets", "trinh quan dac snippets", "trinh chua dac snippets", "trinh cua cac snippets", "trinh cua dan snippets", "trinh cua dac slippers"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug code slippers", "dung bug core snippets"
"locating bug code snippets" » "locating bug code slippers", "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 cua dac snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cua dac snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cua dac snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cua dac snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.