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