Perhaps you should try some spelling variations:
"dung danh tran snippets" » "dung doanh tran snippets", "dung dan tran snippets", "dung dang tran snippets", "dung canh tranh snippets", "dung hanh trang snippets", "dung danh tran slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung danh tran snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung danh tran snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung danh tran snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.