Perhaps you should try some spelling variations:
thanh tung » thanh cong
cua thuong » cua truong, cua phuong, ca thuong
theo chu » theo chieu, chao chu, theo yeu
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap
cho chu » cho thue

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: ((theo chu) OR (cho chu)) tinh - thanh tung ((suat thong) OR (cua thuong)) cong tac toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo chu) OR (cho chu)) tinh - thanh tung ((suat thong) or (cua thuong)) cong tac toan cau~".
• Adding a wildcard symbol may retrieve word variants: ((theo chu) OR (cho chu)) tinh - thanh tung ((suat thong) or (cua thuong)) cong tac toan cau*.