Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"cac toc trinh slippers" » "cac doc trinh slippers", "cac hoc trinh slippers", "cac tra trinh slippers", "cac toi trinh slippers", "cac nuoc trinh slippers", "cac thoi trinh slippers", "cac toc trinh slippery", "cac toc 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 ("cac toc 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 ("cac toc trinh slippers"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( cac toc trinh slippers ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("cac toc trinh slippers"))) or ("locating bug code snippets"))*.