Perhaps you should try some spelling variations:
"hien phuong dich tranh luan van" » "hieu phuong dich tranh luan van", "dien phuong dich tranh luan van", "trien phuong dich tranh luan van", "hien phuong dinh tranh luan van", "hien huong dich tranh luan van", "hien luong dich tranh luan van", "hien phuong dich thanh luan van", "hien phuong sach tranh luan van", "hien phuong dich anh luan van", "hien phuong dich trinh luan van", "hien phuong dich doanh luan van", "hien phuong dich tang luan van"
"hien phuong sach trinh luat van" » "hieu phuong sach trinh luat van", "dien phuong sach trinh luat van", "trien phuong sach trinh luat van", "hien phuong cach trinh luat van", "hien phuong anh trinh luat van", "hien duong sach trinh luat van", "hien phuong sach tranh luat van", "hien phuong hanh trinh luat van", "hien phuong sach kinh luat van", "hien phuong sach trinh luat dan", "hien phuong sach trinh luat va", "hien phuong sach trinh luat ban"

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: (("hien phuong dich tranh luan van") or ("hien phuong sach trinh luat van"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("hien phuong dich tranh luan van") OR ("hien phuong sach trinh luat van")).
• Removing quotes may allow a broader search: (( hien phuong dich tranh luan van ) or ( hien phuong sach trinh luat van )).
• Adding a wildcard symbol may retrieve word variants: (("hien phuong dich tranh luan van") or ("hien phuong sach trinh luat van"))*.