Perhaps you should try some spelling variations:
"dung canh tranh snippets" » "dung danh tranh snippets", "dung anh tranh snippets", "dung doanh tranh snippets", "dung canh trinh snippets", "dung canh thanh snippets", "dung canh tran snippets", "dung canh tranh 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 canh tranh 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 canh tranh snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung canh tranh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.