Perhaps you should try some spelling variations:
vien nganh » vien thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hien hanh » dieu hanh
tranh cua » doanh cua, manh cua
cong cong » cong dong, trong cong, dung cong
cong tap » cuong tap, cong tac, cong tan
tap toan » tap doan, tap quan, bai toan
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 (hien hanh))) or (vien nganh)) - canh tranh cua cong cong tap toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((((hieu manh) OR (hien hanh))) OR (vien nganh)) - canh tranh cua cong cong tap toan cao.
• Adding a wildcard symbol may retrieve word variants: hoc ((((hieu manh) or (hien hanh))) or (vien nganh)) - canh tranh cua cong cong tap toan cao*.