Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung tre can snippets" » "dung tren can snippets", "dung tri can snippets", "dung tru can snippets", "dung tre dan snippets", "dung tiep can snippets", "dung tiem can 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 tre 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: (((("dung tre can snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tre can snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tre can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.