Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung doi nhat slippers" » "huong doi nhat slippers", "dung tai nhat slippers", "dung co nhat slippers", "dung moi nhat slippers", "dung do nhat slippers", "dung dai nhat slippers", "dung doi nhat slippery", "dung doi nhat 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 nhat 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 nhat slippers") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung doi nhat slippers ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung doi nhat slippers") or ("dung java java snippets"))) or ("locating bug code snippets"))*.