Perhaps you should try some spelling variations:
"trinh nhan vat snippets" » "trinh han vat snippets", "trinh phan vat snippets", "trinh nha vat snippets", "trinh nhan va snippets", "trinh nhan tai snippets", "trinh nhan dan snippets", "trinh nhan vat 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 nhan vat 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 nhan vat snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh nhan vat snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh nhan vat snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.