Perhaps you should try some spelling variations:
"trinh cac vat snippets" » "trinh cau vat snippets", "trinh chat vat snippets", "trinh chao vat snippets", "trinh cac van snippets", "trinh cac hat snippets", "trinh cac chat snippets", "trinh cac 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 cac 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 cac vat snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cac vat snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cac vat snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.