Perhaps you should try some spelling variations:
"dung than roi snippets" » "dung thang roi snippets", "dung thanh roi snippets", "dung nhan roi snippets", "dung toan roi snippets", "dung than voi snippets", "dung thanh loi 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 than roi 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 than roi snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung than roi snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung than roi snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.