Perhaps you should try some spelling variations:
"cong anh trinh snippets" » "cong hanh trinh snippets", "cong anh tinh snippets", "cong thanh trinh snippets", "cong danh trinh snippets", "dong anh trinh snippets", "hong anh trinh snippets", "cong anh trinh 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: (((("cong anh trinh snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong anh trinh snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong anh trinh snippets ) or ( dung bug code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong anh trinh snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.