Perhaps you should try some spelling variations:
doi chieu » doc hieu, doi chi, ho chieu
hanh nhan » thanh nhan, anh nhan, hanh han
danh nhan » doanh nhan, thanh nhan, benh nhan
dung cong » dung trong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chieu) or (theo tieu)) xanh - ((hanh nhan) or (danh nhan)) va dung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chieu) OR (theo tieu)) xanh - ((hanh nhan) OR (danh nhan)) va dung cong tac toan cau.
• Adding a wildcard symbol may retrieve word variants: ((doi chieu) or (theo tieu)) xanh - ((hanh nhan) or (danh nhan)) va dung cong tac toan cau*.