Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung toan vinh slippers" » "dung doanh vinh slippers", "dung thang vinh slippers", "dung thanh vinh slippers", "dung tran vinh slippers", "dung toan kinh slippers", "dung tan vinh slippers", "dung toan vinh slippery", "dung toan vinh 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 java java snippets") or ("dung toan vinh slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("dung toan vinh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dung toan vinh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dung toan vinh slippers"))) or ("locating bug code snippets"))*.