Perhaps you should try some spelling variations:
"dung thu cung snippets" » "dung thu code snippets", "ung thu cung snippets", "dung phu cung snippets", "dung thi cung snippets", "dung thu cuong snippets", "dung thuc cung snippets", "dung thu cong 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 thu cung snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))~.
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