Perhaps you should try some spelling variations:
"dan nam code snippets" » "dan nam co snippets", "dan lbm code snippets", "dan nam de snippets", "van nam code snippets", "dong nam code snippets", "dinh nam code snippets", "dan nam code slippers"
"dung hoc code snippets" » "dong hoc code snippets", "dung thuoc code snippets", "trung hoc code snippets", "dung hoc co snippets", "dung hoc cong snippets", "dung hoc de snippets", "dung hoc 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: (((("dan nam code snippets") or ("dung hoc code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan nam code snippets") OR ("dung hoc code snippets"))) OR ("locating bug code snippets")).
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