Perhaps you should try some spelling variations:
"trinh cau doi snippets" » "trinh chat doi snippets", "trinh chao doi snippets", "trinh tu doi snippets", "trinh cau hoi snippets", "trinh cau do snippets", "trinh cau noi snippets"
"dung luan code snippets" » "dung luan cong snippets", "dung luan che snippets", "dung luan de snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets"

You may be able to get more results by adjusting your search query.

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