Perhaps you should try some spelling variations:
"dung ban cong snippets" » "dung ban code snippets", "dung san cong snippets", "dung dan cong snippets", "dong ban cong snippets", "dung bang cong snippets", "dung van cong snippets", "dung phan 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 ban cong 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 ban cong snippets") OR ("dung java java snippets"))) OR ("locating bug core snippets")).
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