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