Perhaps you should try some spelling variations:
"thanh toan code snippets" » "thanh hoa code snippets", "thanh san code snippets", "tinh toan code snippets", "thanh toan co snippets", "thanh toan cong snippets", "thanh toan de snippets", "thanh toan code slippers"
"dung cfd code snippets" » "dung cho code snippets", "dung cua code snippets", "dung co code snippets", "dung cfd 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 cfd code snippets") or ("thanh toan code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cfd code snippets") OR ("thanh toan code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung cfd code snippets") or ("thanh toan code snippets"))) or ("locating bug code snippets"))*.