Perhaps you should try some spelling variations:
"dan tran doan snippets" » "dan tran code snippets", "dan trang doan snippets", "dan tan doan snippets", "dan tran hoan snippets", "dang tran doan snippets", "tan tran doan snippets", "dan than doan snippets"
"locating bug core snippets" » "locating bug code snippets"
"dung java java snippets" » "dung va java snippets"

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 ("dan tran doan snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("dan tran doan snippets"))) OR ("locating bug core snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dan tran doan snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dan tran doan snippets"))) or ("locating bug core snippets"))*.