Perhaps you should try some spelling variations:
"trinh cac dao snippets" » "trinh cau dao snippets", "trinh chat dao snippets", "trinh chao dao snippets", "trinh cac dan snippets", "trinh ca dao snippets", "trinh cac dai snippets", "trinh cac dao slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac 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 dao snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cac dao snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cac dao snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.