Perhaps you should try some spelling variations:
"dung viet dat snippets" » "nang viet dat snippets", "cong viet dat snippets", "mang viet dat snippets", "dung viec dat snippets", "dung viet da snippets", "dung viet dao snippets", "dung viet dat slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung 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 viet dat snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung viet dat snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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