Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
nong cong » cong cong, tong cong, nang cong
hoc hieu » hoc thieu, hoc hien, doc hieu
cua nong » cua cong, cuu nong, cua dong
cong tap » cuong tap, cong tac, cong tan
doan cau » doan dau, doan cap, doanh chau
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 - canh tranh cua nong cong tap ((doan cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh cua nong cong tap ((doan cau) OR (toan cau)).
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh cua nong cong tap ((doan cau) or (toan cau))*.