Perhaps you should try some spelling variations:
"dung hong trong snippets" » "dung hoang trong snippets", "dung thong trong snippets", "dung hong truong snippets", "duong hong trong snippets", "dung huong trong snippets", "dung khong trong snippets", "dung hong trong slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "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: (((("dung hong trong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung hong trong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung hong trong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.