Perhaps you should try some spelling variations:
"trinh phan dua snippets" » "trinh han dua snippets", "trinh quan dua snippets", "thanh phan dua snippets", "trinh phan duc snippets", "trinh phan duy snippets", "trinh phan quan snippets", "trinh phan dua 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 dung code snippets") or ("trinh phan dua snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung dung code snippets") OR ("trinh phan dua snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung dung code snippets") or ("trinh phan dua snippets"))) or ("locating bug code snippets"))*.