Perhaps you should try some spelling variations:
"dung khang toan snippets" » "dung khang code snippets", "dung thang toan snippets", "quang khang toan snippets", "dung nhan toan snippets", "dung khanh toan snippets", "dung thanh toan snippets", "dung hang ton 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 khang 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 khang toan snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
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