Perhaps you should try some spelling variations:
"dung thang anh snippets" » "hung thang anh snippets", "cung thang anh snippets", "dung thuong anh snippets", "dung thanh anh snippets", "dung trang anh snippets", "dung thang thanh snippets", "dung thang anh slippers"
"using a code snippets" » "using a core snippets", "using a code slippers"
"locating bug code snippets" » "locating bug core snippets", "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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