Perhaps you should try some spelling variations:
"dao quang code snippets" » "dao quang de snippets", "do quang code snippets", "dat quang code snippets", "dau quang code snippets", "dao quang 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: (((("dao quang code snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("dao quang code snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))*.