Perhaps you should try some spelling variations:
"dung nhat toan snippets" » "dung nhat code snippets", "dung nhan toan snippets", "dang nhat toan snippets", "dung nha toan snippets", "dung nhat tan snippets", "dung thuat toan snippets", "dung nhat trang snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

Try widening your search to All Fields.

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