Perhaps you should try some spelling variations:
"dung ngo trong snippets" » "dung ngo truong snippets", "dung ngoc trong snippets", "dung go trong snippets", "dung ngon trong snippets", "dong ngo trong snippets", "dung nga trong snippets", "dung ngo 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 ngo 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 ngo 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 ngo trong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.