Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
doanh cua » doanh luan
trong tac » trong cac, tuong tac, trong tan
cua dung » cua dang, cua dong, qua dung
tac toan » tap toan, tam toan, hach toan
toan cao » toan ban, toan tap
bi tinh » vi tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((hieu manh) or (bi tinh)) - toan doanh cua dung trong tac toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((hieu manh) OR (bi tinh)) - toan doanh cua dung trong tac toan cao.
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (bi tinh)) - toan doanh cua dung trong tac toan cao*.