Perhaps you should try some spelling variations:
"duong dung code snippets" » "cuong dung code snippets", "dung dung code snippets", "duong dang code snippets", "duong dung cong snippets", "duong dung co snippets", "duong dung de snippets", "duong dung code slippers"
"danh nhan code snippets" » "doanh nhan code snippets", "thanh nhan code snippets", "benh nhan code snippets", "danh nhan co snippets", "danh nhan con snippets", "danh nhan 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.

You may be able to get more results by adjusting your search query.

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