Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"mon khai cac snippets" » "mon hai cac snippets", "mon khau cac snippets", "mon phai cac snippets", "mon khai thac snippets", "mon thoai cac snippets", "mon tai 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: (((("dung java java snippets") or ("mon khai cac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("mon khai cac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( mon khai cac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("mon khai cac snippets"))) or ("locating bug code snippets"))*.