Perhaps you should try some spelling variations:
"dung san cac snippets" » "dong san cac snippets", "dung sai cac snippets", "dung luan cac snippets", "dung sat cac snippets", "dung sao cac snippets", "dung dan cac snippets"
"dung cfd code snippets" » "dung cho code snippets", "dung cua code snippets", "dung co code snippets", "dung cfd core snippets"
"locating bug code snippets" » "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: (((("dung san cac snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung san cac snippets") OR ("dung cfd code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung san cac snippets") or ("dung cfd code snippets"))) or ("locating bug code snippets"))*.