Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dung » cua dang, cua dong, qua dung
cong van » cong vang, cong san, song van
phan dau » phan tu, hang dau
phan cac » nhan cach, phan van, phan xay

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh cua dung cong van ((phan dau) OR (((phan cac) OR (phan lap))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh tranh cua dung cong van ((phan dau) or (((phan cac) OR (phan lap))))~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh cua dung cong van ((phan dau) or (((phan cac) OR (phan lap))))*.