Perhaps you should try some spelling variations:
"dung toan von snippets" » "dung doanh von snippets", "dung thang von snippets", "dung thanh von snippets", "dung toan ban snippets", "dung toan hoc snippets", "dung toan ho 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.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung toan von snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
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