Perhaps you should try some spelling variations:
"dung xuat hoan snippets" » "dung xuan hoan snippets", "dung luat hoan snippets", "dung quat hoan snippets", "dung xuan hoang snippets", "dung luan hoan snippets", "dung xuan toan snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("dung xuat hoan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung xuat hoan snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung xuat hoan snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.