Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dung than voi snippets" » "dung thang voi snippets", "dung thanh voi snippets", "dung nhan voi snippets", "dung than vo snippets", "dung tan voi snippets", "dung than roi 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 java java snippets") or ("dung than voi snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("dung than voi snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dung than voi snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dung than voi snippets"))) or ("locating bug code snippets"))*.