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