Perhaps you should try some spelling variations:
"dung cfd code snippets" » "dung cho code snippets", "dung co code snippets", "dung cu code snippets", "dung cfd core snippets", "dung cfd code slippers"
"dung cua dat snippets" » "dung luan dat snippets", "dung cho dat snippets", "dung cua dan snippets", "dung cua vat snippets", "dung cua dai snippets", "dung cua dat slippers"
"locating bug code snippets" » "locating bug core snippets", "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung cfd code snippets") or ("dung cua dat snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("dung cfd code snippets") or ("dung cua dat snippets"))) or ("locating bug code snippets"))*.