Perhaps you should try some spelling variations:
vien nganh » vien thanh
tang huong » tang cuong, tang duong, hang thuong
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh kho » trinh khoa, trinh khoi, trang cho
kho tang » cao tang
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu manh) or (vien nganh)) - canh tranh kho tang huong dan ((than cau) or (phan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (vien nganh)) - canh tranh kho tang huong dan ((than cau) OR (phan cau)).
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) or (vien nganh)) - canh tranh kho tang huong dan ((than cau) or (phan cau))*.