Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, hien hanh
tinh sang » tinh quang, tinh trang, trinh san
luan hung » luan chung, luan ung, tuan hung
lan hung » van hung, luan chung, lan phuong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap

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 (dieu hanh)) - tinh sang ((luan hung) OR (lan hung)) cong tan toan cao~.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (dieu hanh)) - tinh sang ((luan hung) or (lan hung)) cong tan toan cao*.