Perhaps you should try some spelling variations:
"trinh cac khoi snippets" » "trinh cau khoi snippets", "trinh chat khoi snippets", "trinh chao khoi snippets", "trinh cac thoi snippets", "trinh cac khoan snippets", "trinh cach thoi snippets", "trinh cac khoi slippers"
"dung cua code snippets" » "dung luan code snippets", "dung cho code snippets", "dung cua cong snippets", "dung cua co snippets", "dung cfd code snippets", "dung cua 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 khoi snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cac khoi snippets") OR ("dung cua code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cac khoi snippets") or ("dung cua code snippets"))) or ("locating bug code snippets"))*.