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