Perhaps you should try some spelling variations:
"dung phan trac snippets" » "dung nhan trac snippets", "dung luan trac snippets", "dung ha trac snippets", "dung phan tap snippets", "dung phan cac snippets", "dung phan tan snippets", "dung phan trac slippers"
"dung cong code snippets" » "dung trong code snippets", "dung cong cong snippets", "dung cong co snippets", "dung cong che snippets", "dung cong 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 phan trac snippets") or ("dung cong code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung phan trac snippets") OR ("dung cong code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung phan trac snippets") or ("dung cong code snippets"))) or ("locating bug code snippets"))*.