Perhaps you should try some spelling variations:
trinh hieu » trinh dieu, trinh thiet, trinh nhiet
qua doanh » cua doanh, qua danh, luat doanh
doanh chu » doanh chau, doanh thu, doanh cho
chu nguoi » chuc nguoi, cho nguoi, phau nguoi
vien nhan » dien nhan, vien than, trien nhan
viet hoa » viet hoan, viet khoa, viet ha
hoc vien » hoc hien, hoc viet, hoc tieng

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

• Performing a fuzzy search may retrieve terms with similar spellings: giao trinh hieu qua doanh chu nguoi viet hoa hoc vien nhan~.
• Adding a wildcard symbol may retrieve word variants: giao trinh hieu qua doanh chu nguoi viet hoa hoc vien nhan*.