Perhaps you should try some spelling variations:
"doan quan code snippets" » "doan quang code snippets", "dan quan code snippets", "toan quan code snippets", "doan quan che snippets", "doan quan co snippets", "doan quan code slippers"
"dung cua code snippets" » "dung luan code snippets", "dung cho code snippets", "dung cua cong snippets", "dung cua co snippets", "dung cfd code snippets", "dung cua 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: (((("doan quan code snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doan quan code snippets") OR ("dung cua code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan quan code snippets ) or ( dung cua code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan quan code snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))*.