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 dich anh luan van", "hien phuong bich tran luan van", "hien phuong dich trinh luan van", "hien phuong dich trinh luat van", "hien phuong dich doanh luan van"
"hien phuong sach tranh luan van" » "hieu phuong sach tranh luan van", "dien phuong sach tranh luan van", "trien phuong sach tranh luan van", "hien phuong cach tranh luan van", "hien phuong anh tranh luan van", "hien duong sach tranh luan van", "hien phuong sach trinh luan van", "hien phuong sach trinh luat van", "hien phuong sach doanh luan van", "hien phuong canh tranh luan van"

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• Performing a fuzzy search may retrieve terms with similar spellings: (("hien phuong dich tranh luan van") OR ("hien phuong sach tranh luan van"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"hien phuong dich tranh luan van\") OR (\"hien phuong sach tranh luan van\"))".
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• Adding a wildcard symbol may retrieve word variants: (("hien phuong dich tranh luan van") OR ("hien phuong sach tranh luan van"))*.