Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung chat nen slippers" » "dung nhat nen slippers", "luong chat nen slippers", "dung cho nen slippers", "dung cham nen slippers", "dung chat dien slippers", "dung chat bien slippers", "dung chat nen slippery", "dung chat nen 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 chat nen 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 chat nen slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dung chat nen slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dung chat nen slippers"))) or ("locating bug code snippets"))*.