Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung doi nhan slippers" » "huong doi nhan slippers", "dung tai nhan slippers", "dung co nhan slippers", "dung doi khang slippers", "dung tri nhan slippers", "dung hoi nhap slippers", "dung doi nhan slippery", "dung doi nhan grippers"
"locating bug code snippets" » "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 doi nhan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung doi nhan slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung doi nhan slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung doi nhan slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.