Perhaps you should try some spelling variations:
"dung linh cao snippets" » "duong linh cao snippets", "dung ninh cao snippets", "dung vinh cao snippets", "dung tinh cao snippets", "dung dinh cao snippets", "dung binh cao snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung linh cao snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung linh cao snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung linh cao snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung linh cao snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.