Perhaps you should try some spelling variations:
"dung dat cao snippets" » "dung va cao snippets", "dung tai cao snippets", "dung dat cau snippets", "dung dam cao snippets", "dung dao cao 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"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"dung dat cao snippets\") OR (\"dung cfd code snippets\"))) OR (\"locating bug code snippets\"))~".
• Removing quotes may allow a broader search: (((( dung dat cao snippets ) OR ( dung cfd code snippets ))) OR ( locating bug code snippets ))~.
• Adding a wildcard symbol may retrieve word variants: (((("dung dat cao snippets") OR ("dung cfd code snippets"))) OR ("locating bug code snippets"))*.