Perhaps you should try some spelling variations:
"dung nghe cao snippets" » "dang nghe cao snippets", "dung nghien cao snippets", "cuong nghe cao snippets", "dung nghe co snippets", "dung nghe nano snippets", "dung nghe chan 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 nghe 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 nghe cao snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung nghe cao snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung nghe cao snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.