Perhaps you should try some spelling variations:
"dung nhat nhan snippets" » "dung nhan nhan snippets", "dang nhat nhan snippets", "dung nha nhan snippets", "dung hat nhan snippets", "dung nhap nhan snippets", "dung nhac nhan snippets", "dung nhat nhan 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 nhat nhan 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 nhat nhan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nhat nhan snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nhat nhan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.