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