Perhaps you should try some spelling variations:
"dun nang code snippets" » "dun nang co snippets", "dun nang cong snippets", "dung nang code snippets", "den nang code snippets", "luan nang code snippets", "dun nang code slippers"
"dung von code snippets" » "dong von code snippets", "dung cong code snippets", "dung va code snippets", "dung von cong snippets", "dung von code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung von code snippets") or ("dun nang code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung von code snippets") OR ("dun nang code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung von code snippets ) or ( dun nang code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung von code snippets") or ("dun nang code snippets"))) or ("locating bug code snippets"))*.