Perhaps you should try some spelling variations:
"dung phan hoan snippets" » "dung nhan hoan snippets", "dung luan hoan snippets", "dung ha hoan snippets", "dung phap hoan snippets", "dung phan hoa snippets", "dung pham hoang snippets"
"hang java java snippets" » "hang 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.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung phan hoan snippets") or ("hang java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung phan hoan snippets") OR ("hang java java snippets"))) OR ("locating bug code snippets")).
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