Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
manh hung » anh huong
cua nhung » va nhung
hach toan » thanh toan, manh toan
hung cua » huong cua, chung cua, khung cua
tac toan » tap toan, tam toan, tich toan

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) OR (chieu tinh)) - manh hung cua nhung cong ((tac toan) OR (hach toan)) cau~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu tinh)) - manh hung cua nhung cong ((tac toan) or (hach toan)) cau*.