Perhaps you should try some spelling variations:
nhung chong » nhung cong, nhung phong, nhung phuong
hieu nganh » vien nganh, hiem ngan, nghiep nganh
hung cuong » hung vuong, hong cuong, hung luong
hieu manh » chieu xanh, dieu hanh, hien hanh
tranh cua » doanh cua, manh cua
tap toan » tap doan, tap quan, bai toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) OR (hieu nganh)) - canh tranh cua ((hung cuong) or (nhung chong)) tap toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (hieu nganh)) - canh tranh cua ((hung cuong) OR (nhung chong)) tap toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (hieu nganh)) - canh tranh cua ((hung cuong) or (nhung chong)) tap toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (hieu nganh)) - canh tranh cua ((hung cuong) or (nhung chong)) tap toan cau*.