Perhaps you should try some spelling variations:
"trinh cac ket snippets" » "trinh cau ket snippets", "trinh chat ket snippets", "trinh chao ket snippets", "trinh cao ket snippets", "trinh cac ke snippets", "trinh cac kieu snippets", "trinh cac ket 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: (((("trinh cac ket snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cac ket snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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