Perhaps you should try some spelling variations:
"danh nhan cong snippets" » "doanh nhan cong snippets", "thanh nhan cong snippets", "benh nhan cong snippets", "danh nhanh cong snippets", "danh phan cong snippets", "danh nhap cong 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: (((("danh nhan cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("danh nhan cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh nhan cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh nhan cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.