Perhaps you should try some spelling variations:
"dung luan code snippets" » "dung luan cong snippets", "dung luan che snippets", "dung luan de snippets", "dung luan code slippers"
"van phan code snippets" » "van phan cong snippets", "van phan co snippets", "van phan che snippets", "van phong code snippets", "van thanh code snippets", "luan phan code snippets", "van phan 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 luan code snippets") or ("van phan code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung luan code snippets") OR ("van phan code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung luan code snippets") or ("van phan code snippets"))) or ("locating bug code snippets"))*.