Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dau noi trinh slippers" » "dau doi trinh slippers", "dau ngoai trinh slippers", "dau hoi tinh slippers", "cau noi trinh slippers", "dang noi trinh slippers", "dau cuoi trinh slippers", "dau noi trinh slippery", "dau noi 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 ("dau noi 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 ("dau noi trinh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dau noi trinh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dau noi trinh slippers"))) or ("locating bug code snippets"))*.