Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dan hoc can snippets" » "van hoc can snippets", "dan toc can snippets", "dai hoc can snippets", "dan hoc dan snippets", "dan hoc cao snippets", "dan hoc cac 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: (((("dan hoc can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan hoc can snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dan hoc can snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dan hoc can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.