Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung toan quan slippers" » "dung doanh quan slippers", "dung thang quan slippers", "dung thanh quan slippers", "dung tran quang slippers", "dung doan quang slippers", "dung van quan slippers", "dung toan quan slippery", "dung toan quan 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 quan 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 quan slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dung toan quan slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dung toan quan slippers"))) or ("locating bug code snippets"))*.