Perhaps you should try some spelling variations:
"cong trinh chao luan va cac cac co loi viet nam" » "cong trinh chat luan va cac cac co loi viet nam", "cong trinh han luan va cac cac co loi viet nam", "cong trinh co luan va cac cac co loi viet nam", "cong trinh khao luan va cac cac co loi viet nam", "cong trinh phap luan va cac cac co loi viet nam", "cong trinh khau luan va cac cac co loi viet nam", "cong trinh chao luan va cac cac co loai viet nam", "cong trinh chao luan va cac cac co hoi viet nam", "cong trinh chao luan va cac cac co oi viet nam", "cong trinh chao luan van cac cac co loi viet nam", "cong trinh chao luat va cac cac co loi viet nam", "cong trinh chao luan va cac cach co loi viet nam", "cong trinh chao luan va ca cac co loi viet nam", "cong trinh chao luan va cac bac co loi viet nam"
"cong trinh cau luan va cac cac cong li viet nam" » "cong trinh chat luan va cac cac cong li viet nam", "cong trinh tu luan va cac cac cong li viet nam", "cong trinh han luan va cac cac cong li viet nam", "cong trinh cu luan va cac cac cong li viet nam", "cong trinh dau luan va cac cac cong li viet nam", "cong trinh lau luan va cac cac cong li viet nam", "cong trinh cau luan va cac cua cong li viet nam", "cong trinh cau luan van cac cac cong li viet nam", "cong trinh cau luat va cac cac cong li viet nam", "cong trinh cau luan va cac cach cong li viet nam", "cong trinh cau luan va ca cac cong li viet nam", "cong trinh cau luan va cac bac cong li viet nam", "cong trinh cau luan va cac cac cong ti viet nam", "cong trinh cau luan va cac cac hong li viet nam", "cong trinh cau luan va cac cac cong hai viet nam", "cong trinh cau luan va cac cac cong le viet nam", "cong trinh cau luan va cac cac cong oi viet nam", "cong trinh cau luan va cac cac cong ly viet nam"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("cong trinh cau luan va cac cac cong li viet nam") or ("cong trinh chao luan va cac cac co loi viet nam"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("cong trinh cau luan va cac cac cong li viet nam") OR ("cong trinh chao luan va cac cac co loi viet nam")).
• Removing quotes may allow a broader search: (( cong trinh cau luan va cac cac cong li viet nam ) or ( cong trinh chao luan va cac cac co loi viet nam )).
• Adding a wildcard symbol may retrieve word variants: (("cong trinh cau luan va cac cac cong li viet nam") or ("cong trinh chao luan va cac cac co loi viet nam"))*.