Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"khuan doi trinh slippers" » "khuan noi trinh slippers", "quan doi trinh slippers", "khoa doi trinh slippers", "khuan doc trinh slippers", "khuan doi tinh slippers", "khuan dong trinh slippers", "khuan doi trinh slippery", "khuan doi trinh 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 ("khuan doi trinh slippers"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("khuan doi trinh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( khuan doi trinh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("khuan doi trinh slippers"))) or ("locating bug code snippets"))*.