Perhaps you should try some spelling variations:
lieu tinh » diep tinh, bien tinh
hanh hang » thanh hang, hang hang, hanh han
cua thong » cua thuong, cua khong, cua tong
ca thuong » cao thuong, cua thuong, va thuong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » 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: ho ((lieu tinh) OR (trieu tinh)) - hanh hang ((cua thong) OR (ca thuong)) cong tac toan cau~.
• Adding a wildcard symbol may retrieve word variants: ho ((lieu tinh) or (trieu tinh)) - hanh hang ((cua thong) or (ca thuong)) cong tac toan cau*.